Posted by Sam on Saturday, October 22, 2011 at 1:57pm.
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 94.0 kg. The mass of the rock is 0.350 kg. Initially the wagon is rolling forward at a speed of 0.520 m/s. Then the person throws the rock with a speed of 17.5 m/s. Both speeds are relative to the ground. Find the speed of the wagon after the rock is thrown directly forward.

physics  drwls, Saturday, October 22, 2011 at 2:04pm
Total momentum is constant.
Write that as an equation and solve for trhe new wagon speed, V'.
94*0.52 = 93.65 V' + 0.345*17.5
If the rock had been trown backwards, there would be a minus sign before the last term.
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