A tennis ball may leave the racket of a player on the serve with a speed of 65.0

Question

A tennis ball may leave the racket of a player on the serve with a speed of 65.0 m/s. If the ball's mass is 0.0600 kg and is in contact with the racket for 0.0300s, what is the average force on the ball? A boy in a canoe throws a 5.40 kg package out horizontally with a speed of 10.0 m/s. Calculate the velocity of the canoe immediately afterwards, assuming it was initially at rest and ignore water resistance. The mass of the boy is 26.0 kg and that of the canoe is 55.0 kg. A dental drill increases in angular speed uniformly from 2.00 rad/s to 400 rad/s in 2.00 seconds. Through what angle does it turn during that time? A 700 kg car goes around a flat curve having a radius of 12.0 meters at a speed of 13.0 m/s. If the maximum force the car may have pointing toward the center of the curve is 9600 Newton, will the car make the circle or slide off track? To determine the center of mass, a physics student lies on a lightweight plank supported by two scales 1.80 m apart. If the left scale reads 290 Newton and the right scale reads 122 Newton, find the distance from her head to the center of mass ignoring the mass of the plank.

Explanation / Answer

here,

1)

the speed of ball , v = 65 m/s

mass , m = 0.06 kg

time taken , t = 0.03 s

the average force on the ball , F = m * v /t

F = 0.06 * 65 /0.03 N

F = 130 N

the average force on the ball is 130 N

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