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A tennis ball of mass 57 g is traveling in the + x direction with a speed of 38 m/s. It is hit by a racket that applies an impulse of 3.5 kg?m/s in the - x direction to the ball.
(a) What is the change in momentum of the ball during the hit? Include the correct sign.
(b) What is the ball's velocity after the hit? Include the correct sign.
(c) If the ball is in contact with the racket for 25 ms, what is the magnitude of the average force applied to the ball?
When the wire is removed, the spheres repel each other with an electrostatic force of 0.0394 N. Of the initial charges on the spheres, with a positive net charge, what was (a) the negative charge in coulombs on one of them and (b) the positive cha..
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