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March 27, 2017

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Here's the question:
A 55 kg swimmer is standing on a stationary 235 kg floating raft. The swimmer then runs off the raft horizontally with a velocity of +4.3 m/s relative to the shore. Find the recoil velocity that the raft would have if there were no friction and resistance due to the water.

I THINK I'm supposed to use this equation: 0=(mAvA)+(mBvB)
But I'm not really sure.

Also I think the answer is supposed to include a direction?

  • Physics - ,

    momentum before = 0
    momentum after = 55 * 4.3 + 235 * v
    momentum after = momentum before so
    236.5 + 235 v = 0

    v = -1 meter/second

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