Assume you push a 20kg child in a little red wagon with a force of 100N. However, the dirt and rocks below the wheels create a frictional force of 25 N. What is the acceleration on the wagon and child?

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?