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What object a collides with object b and bounces back its final momentum is?

The solid that is formed and usually sinks to the bottom of a solution is the

Abatter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. the ball remains in contact with the bat for 2.0 ms. what is the magnitude of the average force exerted by the bat on the ball?