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A body of mass m = 1 kg is moving in a m...

A body of mass m = 1 kg is moving in a medium and experiences a frictional force F = -kv, where v is the speed of the body. The initial speed is `v_(0) = 10 ms^(-1)` and after 10 s, its energy becomes half of the initial energy. Then, the value of k is

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