# A 2 kg ball is moving at 2.4 m/s perpendicular to a wall. Upon hitting the wall, the ball rebounds at 1.0 m/s in the opposite direction. What is the magnitude of the impulse of the ball? (units in kg m/s)

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A 2 kg ball is moving at 2.4 m/s perpendicular to a wall. Upon hitting the wall, the ball rebounds at 1.0 m/s in the opposite direction. What is the magnitude of the impulse of the ball? (units in kg m/s)

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Step 1

The initial momentum of the ball is.

The final velocity of the ball rebounds in opposite direction so the final momentum is, help_outlineImage TranscriptioncloseP; = mv; =(2kg)(2.4m/s) = 4.8kg - m/s P; = mv; =(2kg)(-1.0m/s) =-2.0kg m/s fullscreen
Step 2

The impulse imparted to the ball is,

Substitute the values, to fi... help_outlineImage TranscriptioncloseJ = Ap = P;- P, J=-2.0kg - m/s – 4.8kg m/s =-6.8kg - m/s |J|=6.8kg - m/s fullscreen

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### Newtons Laws of Motion 