1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Arlecino [84]
2 years ago
5

You kick a soccer ball with a speed of 18 m/s at an angle of 43. How long does it take the the ball to reach the top of its traj

ectory
Physics
1 answer:
harkovskaia [24]2 years ago
4 0

The ball reaches the top of its trajectory after 1.25 s

Explanation:

The motion of the ball is a projectile motion, which consists of two independent motions:  

- A uniform motion (at constant velocity) along the horizontal direction  

- A uniformly accelerated motion, with constant acceleration (acceleration of gravity) in the downward direction

To solve the problem we are only interested in the vertical motion of the ball. The vertical velocity of the ball at time t is given by

v_y = u_y -gt

where

u_y is the initial vertical velocity

g=9.8 m/s^2 is the acceleration of gravity

t is the time

The ball reaches its maximum heigth when its vertical velocity is zero:

v_y = 0

Also, the initial vertical velocity is given by

u_y = u sin \theta

where

u = 18 m/s is the initial speed

\theta=43^{\circ} is the angle of projection

Solving the equation for t, we find the time at which the ball reaches the maximum height:

0=u sin \theta -gt\\t=\frac{u sin \theta}{g}=\frac{(18)(sin 43^{\circ})}{9.8}=1.25 s

 

Learn more about projectile motion:

brainly.com/question/8751410

#LearnwithBrainly

You might be interested in
Is the universe infinite
Softa [21]

Answer:

The observable universe is still huge, but it has limits. because it's most likely like an plane all round.

Explanation:

6 0
3 years ago
Read 2 more answers
which view of the macroeconomy suggests that the speed of adjustment Purcell correction would be very quick
horsena [70]

Rational expectations theory suggests that the speed of adjustment Purcell correction would be very quick.

<h3>What Is Rational Expectations Theory?</h3>

The rational expectations theory is a widely used concept and modeling technique in macroeconomics. Individuals make decisions based on three primary factors, according to the theory: their human rationality, the information available to them, and their past experiences.

The rational expectations hypothesis was originally suggested by John (Jack) Muth 1 (1961) to explain how the outcome of a given economic phenomena depends to a certain degree on what agents expect to happen.

  • People who have rational expectations always learn from their mistakes.
  • Forecasts are unbiased, and people make decisions based on all available information and economic theories.
  • People understand how the economy works and how government policies affect macroeconomic variables like the price level, unemployment rate, and aggregate output.

To learn more about Rational expectations theory from the given link

brainly.com/question/16479910

#SPJ4

7 0
1 year ago
When a mass of 0.350 kg is attached to a vertical spring and lowered slowly, the spring stretches 12.0 cm. The mass is now displ
pantera1 [17]

Answer:

The period is T =  0.700 \ s

Explanation:

From the question we are told that  

    The mass is m =  0.350  \ kg

     The extension of the spring is  x =  12.0 \ cm = 0.12 \ m

       

The spring constant for this is mathematically represented as

       k  = \frac{F}{x}

Where F is the force on the spring which is mathematically evaluated as

       F  =  mg  =  0.350 * 9.8

       F  =3.43 \ N

So  

    k  = \frac{3.43 }{ 0.12}

    k  = 28.583 \ N/m

The period of oscillation is mathematically evaluated as

      T =  2 \pi \sqrt{\frac{m}{k} }

substituting values

     T =  2  *  3.142*  \sqrt{\frac{0.35 }{28.583} }

     T =  0.700 \ s

   

7 0
3 years ago
What is the difference between a good conductor and a good insulator?
brilliants [131]

Answer:

Explanation:

In a conductor, electric current can flow freely, in an insulator it cannot.

Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.

Most atoms hold on to their electrons tightly and are insulators.

4 0
2 years ago
What is the kinetic energy f a 25kg object movingat a velocity of 10m/s?
alex41 [277]
Using K.E=1/2MV^2
answer is 125joules
5 0
3 years ago
Other questions:
  • A man has a mass of 110kg. What is his weight?
    8·1 answer
  • Coal as a fuel source led to the invention of
    11·1 answer
  • What do you call the point of interest on a velocity versus time graph?​
    10·1 answer
  • Need help with this physics question!
    13·1 answer
  • Which is not a factor that affects the pressure of a gas in a closed container?
    12·1 answer
  • Which waves have oscillations parallel to their direction of motion
    13·1 answer
  • Which of the following is commonly used to measure distances in space?
    15·2 answers
  • lasers 1 and 2 emit light of the same color, and the electric field in the beam of laser 1 is twice as strong as the e-field of
    9·1 answer
  • A body staring for rest acquries a velocity of 10ms in 5 seconds calculate (a) the accleration(b) the distance covered by the bo
    7·1 answer
  • The area of a piston of a force pump is 8 X 10⁴m². What force must be
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!