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?

physics - bobpursley, Friday, October 15, 2010 at 7:08pm
No, use conservation of momentum
initial momentum= final momentum
96.5*.460=(96.5-.250)Vwagon+.250(-16.5)
physics - Sarah, Friday, October 15, 2010 at 7:15pm
Thanks. Got it

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