You are pushing a heavy crate of mass m = 150 kg up a ramp into the

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Question:

You are pushing a heavy crate of mass m = 150 kg up a ramp into the back of a truck. Assume the crate is on rollers so you can ignore friction. If the truck bed is h = 0.75 m high, how long L does the ramp need to be so that it only takes a force of F = 250 N to push the crate up the ramp