- #1

Raye

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can you help me with this question? any hint is helpful..

an object of weight of 10 kg is to be raised 2 m off ground. there's an inclined plane for it with a freely chosen angle. How much work must be applied for the plane with 0.5 friction when after 1 m , the object its max. velocity of 1 m/s reaches? (it starts moving from 0 m/s)

My theory: after 1m there'll be no acceleration, thus the work would be zero. everything regarding to 0 to 1 m work could be calculated by the work and energy law: W=K_2 - K_1

the energy in the end minus the initial energy: W: 1/2 m v^2-0 = 5 J

The F was originally the one without friction thus:

F: 5+(FN*0.5)

which is not correct since the result is 371.19