Momentum and impulse are killing me.?
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A 12kg ball moving at 2.5m/s collides with a brick wall and rebounds at 1.75m/s. a) Calculate the change in momentum of the ball. Is it: initial: 30kgm/s final: 21kgm/s change in momentum: 30-21 = 9kg m/s ? b) calculate the impulse the ball applies to the wall. So, is it 9 Ns ? c) If the collision lasts 0.15 s, calculate the force the wall places on the ball. Do I use F=I/t ? Thank you so so so much!
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Answer:
a) and b) are correct c) is correct too = 9/0.15= 54 kg force.
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