Question

A boy of mass 60 kg stands on a boat of mass 250 kg. This system is stationary. From the boat, the boy throws a rock of mass 1 kg into the water with a velocity of 10 m/s. What is the magnitude and direction of the boat's motion as a result of this?

A)
The boat moves in the direction of the rock with a velocity of 31 m/s.


B)
The boat moves in the direction of the rock with a velocity of 0.02 m/s.


C)
The boat moves in a direction opposite to the rock with a velocity of 0.03 m/s


D)
The boat moves in a direction opposite to the rock with a velocity of 10.1 m/s.

Answers

clearly not A or B
since the rock is so much smaller than the boat system, the boat will move much more slowly, right?

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