At a wedding reception, you notice a small boy, 25 kg running and sliding on a dance floor. If the coefficient of friction between the boy’s pants and the floor is 0.15, what is the frictional force of the sliding boy?

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Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

Agust of wind pushes a beach ball with a force of 9 newtons.the ball rolls 10 meters in 3 seconds. what is the power of the wind?