A car of mass 700 kg and movie at a speed of 30 m per 2nd collides with a stationary truck of mass 1400 kg and the 2 vehicles locked together on impact and the combined velocity of the car and the truck after the collision is what

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?