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
Mumz [18]
2 years ago
7

a boy throws a ball straight up into the air. it reaches its highest point after 4 seconds.how fast was the ball going when it l

eft the boy's hand​
Physics
1 answer:
baherus [9]2 years ago
3 0

Answer:

Explanation:

The most important thing to remember about parabolic motion in physics is that when an object reaches its max height, the velocity right there at the highest point is 0. Use this one-dimensional motion equation to solve this problem:

v = v₀ + at and filling in:

0 = v₀ + (-9.8)(4.0) **I put in 4.0 for time so we have more than just 1 sig fig here**

0 = v₀ - 39 and

-v₀ = -39 so

v₀ = 39 m/s

You might be interested in
What happens if different lights are shined through a prism
shusha [124]
The light will bend when in 
7 0
3 years ago
Read 2 more answers
Which parts of Dalton’s atomic theory had to be revised
eduard
<span> The indivisibility of an atom was proved wrong an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes </span>part<span> in chemical reactions</span>
7 0
3 years ago
Assuming 84.0% efficiency for the conversion of electrical power by the motor, what current must the 13.0-V batteries of a 716 k
tino4ka555 [31]

Answer:

\mathbf{ current(I) =1766.67 \ A}

Explanation:

Given that:

The air resistance and friction = 700 N

The gravity caused force = 716 × 9.8 = 7016.8

Total force = (7016.8 + 700) N

Total force = 7716.8 N

∴

13 \times  current(I) \times 0.84 = \dfrac{7716.8 \times 300}{2 \times 60}

current(I) \times 10.92= 19292

current(I) = \dfrac{19292}{10.92}

\mathbf{ current(I) =1766.67 \ A}

8 0
2 years ago
Please answer! thank you!
lesantik [10]

Answer:

Maybe A.... I'm not sure

Explanation:

8 0
2 years ago
Read 2 more answers
True or false<br><br>as mass increases the gravitational force decreases​
blondinia [14]
The answer to this question is true I believe
7 0
2 years ago
Read 2 more answers
Other questions:
  • Calculate A, E, μ, cv and S for 1 mole of Kr at 298 K and 1 atm (assuming ideal behavior)
    13·1 answer
  • How much force is needed to accelerate a 1,500 kg car at a rate of 8 m/s2?
    10·1 answer
  • What does the ideal gas law allow a scientist to calculate that the other gas laws do not?
    9·2 answers
  • i got the right answer for this question (pretty sure i guessed or just asked me teacher the answer?) but can someone explain ho
    5·2 answers
  • Which of the following energy resources produces greenhouse gases?
    10·1 answer
  • How much force is needed to accelerate a 4kg mass at 12m/s/s?
    10·2 answers
  • What is the change of momentum on a 45,000 kg airplane when it changes its velocity from 242 m/s to 258 m/s?
    9·1 answer
  • What is the length of the x-component of the vector shown below?
    5·1 answer
  • A square wave has amplitude 0 V for the low voltage and 4 V for the high voltage. Calculate the average voltage by integrating o
    14·1 answer
  • A boat is rowed perpendicular to the shore of a river that flows at 3.0 m/s as shown in the
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!