Two children of masses 40 kg and 20 kg are on a see saw board 1 m long with pivot at the center.
How far from the pivot must 40 kg child sit on one side if the smaller child is sittia on the other end
of the board?
0.5 m
8. 0.25 m
C. 0.75 m
D. None of these
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Explanation:
Two hockey players are about to collide on the ice. One player has a mass of 66 kg and is traveling at 1.5 m/s north. The other has a mass of 75 kg and is
traveling at 1.2 m/s south. The system consists of the two tlockey players.
According to the law of conservation of momentum, what is the total
momentum of the system after they collide? Assume the collision is an
elastic collision.
A. 189 kg-m/s south
O B. 9 kg-m/s north
C. 189 kg. m/s north
D. 9 kg m/s south
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