A tennis ball with a mass of 60 grams is moving at 20 m/s. It is struck so that it returns back along the direction it came from at 22 m/s. If the contact time between the ball and the racket was 70 ms, what was the average force exerted on the ball by the racket?

云 HI 5 F. %24 -10 Part A Jeanette is playing in a 9-ball pool tournament. She will win if she sinks the 9-ball from the final rack, so she needs to line up her shot precisely. Both the cue ball and the 9-ball have mass m, and the cue ball is hit at an initial speed of v. Jeanette carefully hits the cue ball into the 9-ball off center, so that when the balls collide, they move away from each other at the same angle 0 from the direction in which the cue ball was originally traveling (see figure). Furthermore, after the collision, the cue ball moves away at speed vf, while the 9-ball moves at speed vp. (Figure 1) Find the angle 0 that the 9-ball travels away from the horizontal, as shown in the figure. Express your answer in degrees to three significant figures. > View Available Hint(s) For the purposes of this problem, assume that the collision is perfectly elastic, neglect friction, and ignore the spinning of the balls. Submit Provide Feedback Figure 1 of 1 MacBook Air 08 F3 O00 000 F2…

A 2.76-kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle (see the figure below). If the ball is in contact with the wall for 0.176 s, what is the average force exerted by the wall on the ball?

A drunk driver in a 2100 kgkg car plows into a 2000 kgkg parked car with its brake set. Police measurements show that the two cars skid together a distance of 21 mm before stopping. If the effective coefficient of friction is 0.74, how fast was the drunk going just before the collision?