Question

A force of 35 N is needed to keep a 5.0 kg body moving at a constant speed of 7.5 m/s. What power is needed to sustain the motion of the mass? ​

Answer 1

Answer:

262.5 watts

Explanation:

Power =Force*velocity

P=f*v

P=35*7.5

P=262.5 w

Answer 2

Answer:

The amount of power needed to sustain the motion of the mass is 262.5 W.

Explanation:

Given,

The force acting on the body of mass m = 5 Kg is (F) = 35 N.

The constant speed with which the body is moving is (v) = 7.5 m/s.

To find,

The power needed to sustain the motion of the mass (P)

Concept,

Power acting on the body is defined as the energy possessed by the body in a unit time.

i.e. P = E/t

Also, power can be written as:

P = F × v

Calculation,

Now, we have F = 35 N and v = 7.5 m/s

⇒ P = F × v

⇒ P = 35 N × 7.5 m/s

⇒ P = 262.5 Watts

Therefore, the amount of power needed to sustain the motion of the mass is 262.5 W.

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