A worker pushes a 100 kg crate upward a distance 5.0 m along a frictionless conveyer...
A worker pushes a 100 kg crate upward a distance 5.0 m along a frictionless conveyer that makes an angle of 30 degrees with the horizontal. The force she exerts is parallel to the conveyer. If the speed of the crate is constant, the work done by the worker is
A
250 J
B
-2,500 J
C
2,500 J
D
500 J
E
-250 J
F
-500 J
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A worker pushes a 100 kg crate upward a distance 5.0 m along a
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