A safe weighing 2000N is to be lowered at constant speed down the ramp 4m long from a truck 2m high; a. If the coefficient of sliding friction between the safe and the ramp is 0.3, will the safe need to be pulled down or held back? b. How great a force parallel to the ramp is needed?

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A safe weighing 2000N is to be lowered at constant speed down the ramp 4m long from a truck 2m high; a. If the coefficient of sliding friction between the safe and the ramp is 0.3, will the safe need to be pulled down or held back? b. How great a force parallel to the ramp is needed?
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