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Q.

A box weighing 20 kg is pushed along the floor at a constant speed by applying a horizontal force. If the coefficient of friction is 0.25, then force applied is:

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a

5 N

b

200 N

c

10 N

d

50 N

answer is C.

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Detailed Solution

Force applied = friction = μmg = (0.25) (20) (10) = 50 N

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