Two vehicles are travelling at 13 m/s. The driver of the truck then accelerates at 1.2 m/s? until both vehicles are travelling at 20 m/s. Calculate the time taken for this acceleration.

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?