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 is the acceleration (in m/s2) of the block if the tension in the rope is 12 N

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 is the acceleration (in m/s2) of the block if the tension in the rope is 12 N

Explanation / Answer

Apply Newton second law

T- fk = ma

T- ukmg = ma

a = T- ukmg/m

= 12 N - 0.2(4)(9.8)/4

=1.04 m/s^2

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