First slide

Work Energy Theorem

Question

A body of mass 1 kg is moving along positive x-axis with velocity 2 m/s. At t = 0, a constant force, parallel to positive y-axis, starts acting on the body and after 5 sec, speed of the body is found to be 4 m/s. Then work done by the force in 5 sec is

Moderate

A

12 J
B

6 J
C

16 J
D

10 J

Solution

By work – energy theorem
$\begin{array}{l} W = {(KE)}_{f} - {(KE)}_{i} \\ = \frac{1}{2} \times 1 \times {(4)}^{2} - \frac{1}{2} \times 1 \times {(2)}^{2} j oule \\ = 6 J \end{array}$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App