First slide

Work done by Diff type of forces

Question

A body moves from rest with a constant acceleration. Which one of the following graphs represents the variation of its kinetic energy K with the distance travelled x ?

Moderate

A
B
C
D

Solution

From work-energy theorem,
work done = change in kinetic energy
$\Rightarrow K \propto x$ (as F = constant because a = constant)
Therefore, K-x graph is a straight line passing through origin.

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