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A ball of mass .80 kg hits a wall with a speed of 6.8 m/s and...

A ball of mass .80 kg hits a wall with a speed of 6.8 m/s and an angle of 37 degrees with respect to the normal. It rebounds with the same angle and vector (see above) a.What impulse acts on the ball? b. The force acts for .0025 seconds. What force (direction and magnitude) acts on the ball?

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Answer #1

(a)

When the ball hits the ball, it makes an angle of   with the Normal.

That is Initial Momentum of the body along the Horizontal

Final Momentum along the Horizontal ( rebounding )

Change in momentum  

Change in momentum is Impulse

(b)

Force = Impulse / time   

This force acts normally from the wall to the ball

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