- #1
BrainMan
- 279
- 2
Homework Statement
A 0.3-kg ball falls from a height of 30 m from rest and rebounds with half its velocity upon impact with a sidewalk. Find (a) the momentum delivered to the Earth and (b) the impulse delivered to the earth.
Homework Equations
FΔt= mvf-mvi
The Attempt at a Solution
What I tried to do was I found the velocity using the potential energy formula to find the energy and then the kinetic energy formula to find the velocity right before the ball hit the ground. I then multiplied the velocity by the mass to find the initial momentum. After that I divided the velocity by two because it said that when it rebounded it had half the velocity. Then I multiplied half the initial velocity by the mass to get the final momentum. Then I used the equation FΔt= mvf-mvi to find the impulse. I got -3.7125 and the answer was 11 for both (a) and (b)