First slide

Work

Question

A block of mass 10kg is kept on an inclined plane of inclination $30^{\circ}$ . If the inclined plane is moving upwards with acceleration of ${2ms}^{-2}$ and the block does not slide on the plane, work done by gravity in 3 seconds is $({g=9.8ms}^{- 2})$

Moderate

A

-441J
B

441J`
C

-882J
D

882J

Solution

$\begin{array}{l} W = FSCos θ \\ W = mg \times (u t + \frac{1}{2} a t^{2}) \times \cos 180 \\ W = 10 \times 9.8 \times \frac{1}{2} \times 2 \times 9 \times (- 1) \\ W = - 882 J \end{array}$

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