First slide

Work

Question

The adjoining diagram shows the velocity versus time plot for a particle. The work done by the force on the particle is positive from

Moderate

A

A to B
B

B to C
C

C to D
D

D to E

Solution

From the graph it is clear that force is acting on the particle in the region AB and due to this force kinetic energy (velocity) of the particle increases. So the work done by the force is positive.

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