Rock Wagon A wagon is rolling forward on level ground. Friction is negligible.A
ID: 1742975 • Letter: R
Question
Rock Wagon
A wagon is rolling forward on level ground. Friction is negligible.A person sitting in the wagon throws a rock.
(a) Does the momentum of the wagon increase, decrease, or remainthe same when the rock is thrown directly forward?
(b) Does the momentum of the wagon increase, decrease, or remainthe same when the rock is thrown directly backward?
(c) What can be concluded about the speed of the wagon after therock is thrown?
The total mass of the wagon, rider, and rock is 110.0 kg. The mass of the rock is 0.380 kg. Initially the wagon is rolling forward at aspeed of 0.560 m/s. Then the rock isthrown with a speed of 19.0 m/s. Bothspeeds are relative to the ground.
(d) What is the final speed vf of the wagonafter the rock is thrown forward?
(e) What is the final speed vf of the wagonafter the rock is thrown backward?
Explanation / Answer
a.) the momentum of the wagon decreases.
b.) the momentum of the wagon increases.
c.) the speed of the wagon is greater when the rock is thrownbackward than when it is thrown forward.
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