Physics questions, please help?

[Nyx Lee]

1. A ball of mass 50g moving horizontally at a speed of 40cm/s strikes a suspended plate of mass 1000g and rebounds from it with a speed of 25cm/s. Find the speed with which the plate commences to move. (Answer: 3.25cm/s)

2. Suppose your hockey stick exerts an average force of 150N south on the ball as you hit it.
a) What is the average force the ball exerts on the hockey stick?
b) Does it follow that the net force on the ball is 0?

 

[Dark Destination]

1. A ball of mass 50g moving horizontally at a speed of 40cm/s strikes a suspended plate of mass 1000g and rebounds from it with a speed of 25cm/s. Find the speed with which the plate commences to move. (Answer: 3.25cm/s)

2. Suppose your hockey stick exerts an average force of 150N south on the ball as you hit it.
a) What is the average force the ball exerts on the hockey stick?
b) Does it follow that the net force on the ball is 0?

Q1. Mass of ball = 0.05 kg.

Change in velocity = 65 m/s.

So F=ma.

F = 0.05 x 65 = 3.25 N.

A 3.25 N force is exerted by the ball on the plate. It has a mass of 1 kg, so it's acceleration will be 3.25 m/s^2.

 

[A*(a*)]

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