Two masses mA = 6 kg and mB = 4 kg collide

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Two masses mA = 6 kg and mB = 4 kg collide. Before the collision, the mass A goes to the right at 5 m/s while B goes to the left at 5 m/s. Left at 12 m/s. After the collision, mass B rebounds with a speed of 1 m/s to the right.

a. What is the speed of A after the collision?

b. Was the collision elastic?

c. If the collision lasted 0.1 s, what is the force of impact (assumed to be 0.1 s) on A?

constant)?