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Velocity-Time Problems

  • Thread starter @d@m
  • Start date
  • #1
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1. A ball falls from rest from a height of 16 m and hits the ground after 4.0 s.
(a) What was the velocity of the ball after 4.0 seconds?
(b) What is the acceleration of the ball?


Homework Equations





The Attempt at a Solution


(a) v=d/t = 16m/4.0s = 4.0 m/s (down)
(b) a = v2-v1/t = 4.0m/s-0.0m/s/4.0 s = 1.0m/s/s
 

Answers and Replies

  • #2
Delphi51
Homework Helper
3,407
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Unless we are dealing some other planet here, you know the acceleration is 9.81 m/s^2 downward. So you can't use v =d/t, which is a constant speed formula.
 

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