a 6kg crate being pushed across a rough tabletop by a horizontal force of 15 N.it moves with a constant velocity of 3ms−1  for 3 seconds. swhat magnitude of the frictional force acting on the crate?

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It is given that the crate placed on a rough table top moves with a constant velocity of 3 m/s when a force of 15 N is applied. The mass of the box is 6 kg. The force due to friction between the crate and the table top acts in a direction opposite to that in which the force of 15 N is being applied. As the crate is moving at a constant velocity in spite of the applied force, the net force or the sum of the force applied and the frictional force acting on it is zero.

This gives the frictional force acting on the crate is equal to 15 N.

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