A car starts from rest (initial velocity = 0), and has constant acceleration to t = 12s. 4.0s after start the car has a speed of 36km/h (10 m/s). How far has the car gone in the 11th second?

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?