Question

A body of 4.0 kg is lying at rest. Under the action of a constant force, it gains a speed of 5 m/s. The work done by the force will be____.
A) 50J B) 30J C) 20J D) 40J

Answer 1

Explanation:

Hey dear,

◆ Answer-

W = 50 J

◆ Explaination-

# Given-

m = 4 kg

v = 5 m/s

# Solution-

Here, work done on the body is kinetic energy provided by given force.

W = K.E.

W = 1/2 mv^2

W = 1/2 × 4 × 5^2

W = 2 × 25

W = 50 J

Therefore, work done by force on the body is 50 J.

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