   Chapter 5, Problem 19CQ

Chapter
Section
Textbook Problem

If the net work done on a particle is zero, which of the following statements must be true? (a) The velocity is zero. (b) The velocity is decreased. (c) The velocity is unchanged. (d) The speed is unchanged. (e) More information is needed.

To determine
Which statement is true when the net work done on the particle is zero.

Explanation

Given Info:

The net work done on the particle is zero.

Formula to calculate the net work done on the particle is,

W=fs=(ma)s       (I)

• f is the force
• s is the displacement
• a is the acceleration

Form the equation (I) when the velocity is unchanged, the acceleration of the particle is zero. Hence, the net work done on the particle is zero

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