Q. A baseball (m = 148 g) approaches a bat horizontally at a speed of 41.5 m/s (93 mi/h) and is hit straight back at a speed of 45.9 m/s (103 mi/h). If the ball is in contact with the bat for a time of 1.20 ms, what is the average force exerted on the ball by the bat? Neglect the weight of the ball, since it is so much less than the force of the bat. Choose the direction of the incoming ball as the positive direction.
Q. A 65 kg passenger is rounding the bottom of a curve (with radius 17 m) of a roller coaster. If the coasters speed is 20 m/s, what is the normal force of the seat on the passengers butt?