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
Nezavi [6.7K]
2 years ago
10

A ball is thrown vertically downwards with a speed 7.3 m/s from the top of a 51 m tall building. With what speed will it hit the

ground, in units of m/s? Assume that air resistance is negligible. Give the answer as a positive number.
Physics
2 answers:
ddd [48]2 years ago
8 0

Answer:

32.46m/s

Explanation:

Hello,

To solve this exercise we must be clear that the ball moves with constant acceleration with the value of gravity = 9.81m / S ^ 2

A body that moves with constant acceleration means that it moves in "a uniformly accelerated motion", which means that if the velocity is plotted with respect to time we will find a line and its slope will be the value of the acceleration, it determines how much it changes the speed with respect to time.

When performing a mathematical demonstration, it is found that the equations that define this movement are the follow

\frac {Vf^{2}-Vo^2}{2.a} =X

Where

Vf = final speed

Vo = Initial speed =7.3m/S

A = g=acceleration =9.81m/s^2

X = displacement =51m}

solving for Vf

Vf=\sqrt{Vo^2+2gX}\\Vf=\sqrt{7.3^2+2(9.81)(51)}=32.46m/s

the speed with the ball hits the ground is 32.46m/s

statuscvo [17]2 years ago
3 0

Answer:

The speed will be 33 m/s.

Explanation:

The equations for height and velocity of the ball are as follows:

y = y0 + v0 · t + 1/2 · g · t²

v = v0 + g · t

Where:

y = height at time "t".

y0 = initial height.

v0 = initial velocity.

t = time.

g = acceleration due to gravity (-9.8 m/s² considering the upward direction as positive)

v = velocity at time "t".

Let´s place the origin of the frame of reference on the ground and consider the upward direction as positive.

First, let´s find the time it takes the ball to reach the ground:

y = y0 + v0 · t + 1/2 · g · t²

When the ball hits the ground, y = 0. Then:

0 = 51 m - 7.3 m/s · t - 1/2 · 9.8 m/s² + t²

Solving the quadratic equation:

t = 2.6 s

Now, with this time, we can calculate the velocity at the moment when the ball hits the ground:

v = v0 + g · t

v = -7.3 m/s - 9.8 m/s² · 2.6 s

v = -33 m/s

The speed will be 33 m/s.

You might be interested in
You are at the top of the Empire State Building on the 102nd floor, which is located 373 m above the ground, when your favorite
Liula [17]

Answer:

1.5 m

Explanation:

H = actual height of the superhero = ?

H₀ = height of the superhero as observed = 1.73 m

v = speed of the superhero = 0.50 c

Using the equation

H = H_{o} \sqrt{1 - \left ( \frac{v}{c} \right )^{2}}

Inserting the values

H = 1.73 \sqrt{1 - \left ( \frac{0.50 c}{c} \right )^{2}}

H = 1.5 m

3 0
3 years ago
Does heat demagnetize?
Nastasia [14]

Answer:

Yes

Explanation:

Heat affects the magnets because it confuses and misaligns the magnetic domains, causing magnetism to decrease

3 0
2 years ago
A car changes speed from 25 m/s to 10 m/s in 240 seconds. Describe its acceleration.​
Dmitry_Shevchenko [17]

Explanation:

Acceleration is change in velocity over change in time:

a = Δv / Δt

a = (10 m/s - 25 m/s) / (240 s - 0 s)

a = -0.0625 m/s²

So the car decelerates at 0.0625 m/s².

7 0
3 years ago
What situation would give you a mechanical advantage? *
const2013 [10]
D. Using a fixed-pulley system
3 0
3 years ago
What is night vision pls tell fast
mario62 [17]

Answer:

Night vision is when you can see in the dark or at night like owls

Explanation:

3 0
2 years ago
Read 2 more answers
Other questions:
  • A fish swims 12.0 m in 5.0 s. It swims the first 4.0 m in 2.0 s, the next 3.0 m in 1.2 s, and the last 5.0 m in 1.8 s. What is t
    9·1 answer
  • A 5 cm object is 6 cm from a convex lens, which has a focal length of 7 cm. What is the distance of the image from the lens
    13·1 answer
  • An underwater diver sees the sun 50° above horizontal. how high is the sun above the horizon to a fisherman in a boat above the
    11·1 answer
  • On August 15, 2005, a spacecraft in a 190-km, 52 °-inclination circular% parking orbit around the earth departed on a mission to
    14·1 answer
  • Which best explains parrallel forces
    12·1 answer
  • 1) For a positive point charge, the lines radiate ………. . While, for a negative point charge, the lines converge …………. .
    9·1 answer
  • What happens to light when it is shone through concave lenses? (1 point)
    13·2 answers
  • Why are nuclear reactions used in nuclear power plants
    15·1 answer
  • A ball with an initial velocity of 5 m/s rolls off a horizontal table with a height of 1.0
    15·1 answer
  • A race car has a mass of 710 kg. It starts from rest and travels 40 m in 3.0 s. The car is uniformly accelerated during the enti
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!