Physics humanitas 2014 question 60

A ball of mass 160 g is travelling at 1.5 m/s and hits a second identical ball that is at rest. The second ball moves off at 1.0 m/s. The two balls are in contact for 1.0 × 10-2 s. What is the average force between the balls while they are in contact?
A. 16 N
B. 16000 N
C. 8000 N
D. 8.0 N
E. 0.016 N


The answer is A

Edit: I messed up with the vf and vi. :frowning_face:

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