A block with a mass of 4 kg is pulled across a horizontal surface at constant sp

Question

A block with a mass of 4 kg is pulled across a horizontal surface at constant speed by a horizontally directed rope.

The coefficient of kinetic friction between the block and the surface is k = 0.2. What net work (in J) has been done on the block after the block has slid 5 m?

A block with a mass of 4 kg is pulled across a horizontal surface at constant speed by a horizontally directed rope.

The coefficient of kinetic friction between the block and the surface is k = 0.2. What net work (in J) has been done on the block after the block has slid 5 m?

Explanation / Answer

by work energy theroem

Net work has been done on the block = change in kinetic energy of block

so, velocity of block is constant. so, change in kinetic energy of block will be zero.

change in kinetic energy = 0

Net work has been done on the block = 0

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