A baseball (m = 153 g) approaches a bat horizontally at a speed of 37.6 m/s (84.1 mi/h) and is hit straight back at a speed of 52.1 m/s (117 mi/h). If the ball is in contact with the bat for a time of 1.58 ms, what is the average force exerted on the ball by the bat? Neglect the weight of the bat, since it is so much less than the force of the bat. Choose the direction of the incoming ball as the positive direction.

A baseball with a mass of 150 g is thrown horizontally with a speed of 40.1 m/s (90 mi/h) at a bat. The ball is in contact with the bat for 1.00 ms and then travels straight back at a speed of 45.2 m/s (101 mi/h). Determine the average force (in N) exerted on the ball by the bat. Neglect the weight of the ball (it is much smaller than the force of the bat) and choose the direction of the incoming ball to be positive. (Indicate the direction with the sign of your answer.)

A cricket ball of mass 155 g is hit at a speed of 164 km/h straight at a nearby fielder, who catches it. If it takes 391 x 10-3 seconds for the fielder's hands to stop the ball, what is the force (assumed to be constant) between the fielder's hands and the ball? (Units: N)

you were told that the girl's mass was three-fourths that of the boy's mass. The boy has a velocity of v = 0.77 m/s to the left. What would be the girl's velocity in this case? (Consider the ice to be frictionless. Enter the magnitude only.)