# Under the action of a certain force, a body with a mass of 4 kg passed for 1 min

Under the action of a certain force, a body with a mass of 4 kg passed for 1 min on a horizontal surface of 15 m. The sliding friction coefficient is 0.2. Find useful body power while moving.

The work done by the friction force will be equal to:

A = F * S, where F is the friction force, S is the distance.

The friction force is determined by the formula:

F = η * m * g, where η is the coefficient of friction, m is the mass, g is the acceleration of gravity.

By definition, the power is determined by the formula:

P = A / t, where A is work, t is time.

Then we get:

P = η * m * g * S / t.

Time must be expressed in seconds 1 minute = 60 seconds.

P = 0.2 * 4 * 10 * 15/60 = 2 W.

Answer: the required power was 2 W.

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