First slide

Work done by Diff type of forces

Question

A 3 kg block is projected with a velocity of 4 m/s along a horizontal rough surface. The block stops after travelling some distance. The work done by frictional force is

Easy

A

18 Joule
B

-12 Joule
C

32 Joule
D

-24 Joule

Solution

By work energy theorem
work done by frictional force = change in kinetic energy
$= 0 - \frac{1}{2} \times 3 \times {(4)}^{2} J = - 24 Joule$

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