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April 28, 2015

Homework Help: physics

Posted by Sarah on Friday, October 15, 2010 at 6:58pm.

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 96.5 kg. The mass of the rock is 0.250 kg. Initially the wagon is rolling forward at a speed of 0.460 m/s. Then the person throws the rock with a speed of 16.5 m/s. Both speeds are relative to the ground. Find the speed of the wagon after the rock is thrown directly forward.
m/s

Find the speed of the wagon after the rock is thrown directly backward.


Do I use conservation of energy equation?

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