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2.00-kg block A traveling east at 20.0 m/s collides with 3.00-kg block B traveling west at...

2.00-kg block A traveling east at 20.0 m/s collides with 3.00-kg block B traveling west at 10.0 m/s. After the collision, block A has a velocity of 5.00 m/s due west. (a) How much kinetic energy was lost during the collision? (b) If the blocks were in contact for 75 ms, determine the magnitude and direction of average force exerted on block A.

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