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Force Exerted for Constant Velocity of a Truck

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You can push a 335 N trunk up a 20.0° inclined plane at a constant velocity by exerting a 209 N force parallel to the plane's surface. What force must be exerted on the trunk so that it would instead slide down the plane with a constant velocity?

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Solution Summary

This solution helps go through how to calculate the force exerted for constant velocity of a truck.

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In the initial case, when the body is sliding up, the friction (f) should act in the downward direction along the incline.
by applying Freebody diagram along the incline, we have

F - [ f + Mg sin (Theta) ] = M(Zero) ...

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