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In an industry a 300 kg crate is dropped...

In an industry a 300 kg crate is dropped vertically from a packing mechine onto a conveyor belt moving at `1.2 m//s` The coefficient of kinetic friction between belt and crate is 0.4 After a short time, slipping between the belt and the crate ceases and the crate then moves along with the crate ceases and the crate then moves along with the belt . For the period of time during which the crate is being brought to rest relative to the belt, calculate, for a reference frame (a) the kinetic energy supplied to the crate (b) the magnitude of the kinetic frictional force acting on the crate, the magnitude of energy supplied by the motion (c) Why are the answers to (a) and (c) different

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