Margie (of mass 44kg) and Bill (of mass 70 kg), both with brand new roller blades, are at rest facing each other in the parking lot. They push off each other and move in opposite directions, with Margie moving at a constant speed of 18 ft/s. At what speed is Bill moving? Answer in units of ft/s.
Physics Help?!!?
If we neglect friction, because of the new rollerblades, we have a momentum problem where total momentum before and total momentum after have to be equal. The mass multiplied by velocity for Margie have to be equal (and opposite) to mass times velocity for Bill.
Margie: mv = 44 (18) = 792
Bill : mv = 70 (v) = 792
divide by 70 on both sides...
Bill's velocity = 11.31 ft.sec
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