You are out ice skating, cruising along at a speed of 5m/s. You never learned ho

Question

You are out ice skating, cruising along at a speed of 5m/s. You never learned how to stop, so you attempt to slow yourself down by taking off your coat and throwing it forward (in the same direction as you are moving) with a velocity of 20 m/s. Assume that you have a mass of 75 kg and that your coat has a mass of 3 kg (78 kg all together when you are weaing your coat).

What is the velocity (not momentum) after you have thrown your coat?
I have already calculated the total momentum to be 390 kg m/s before you take your coat off and throw it but I'm not sure how to proceed from here...

Explanation / Answer

conservation of momentum 78*20 = 75*V V =20.8 m/s momentum = 75*20.8 =1560 Kgm/s

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