A force F is applied to the body and body displaces in the direction of force applied. If the force applied to the body is doubled, the work done will be

Join BYJU'S Learning Program

If a force of 4 N is applied on a body of mass 20 kg, then the work done in 3rd second will be

The correct option is C 2 JHere, a=fm=420=15m/s2Distance travelled by by body in 3rd secondS3rd=0+15×2(2×3−1)=0.5 mHence, work done, W=f×S3rd=4×0.5=2 J.

If a force of $4 N$ is applied on a body of mass $20 k g$ , then the work done in $3 r d$ second will be

The correct option is C $2 J$
Here, $a = \frac{f}{m} = \frac{4}{20} = \frac{1}{5} m / s^{2}$
Distance travelled by by body in $3 r d$ second
$S_{3 r d} = 0 + \frac{1}{5 \times 2} (2 \times 3 - 1) = 0.5 m$
Hence, work done, $W = f \times S_{3 r d} = 4 \times 0.5 = 2 J$ .