- #1
superaznnerd
- 59
- 0
Homework Statement
a ball of 2kg falls from rest froma 5m height and collides elastically with the floor below. what is the magnitude change in the object's momentum?
Homework Equations
The Attempt at a Solution
I did S=So+.5aT^2
I solved for the time it takes to reach the ground, which is 1 second.
Next, I figured out that the velocity on impact with ground is 10m/s
I did 10m/s *2kg = 20kgm/s
however, the answer is 40kgm/s. Can someone explain? thanks