First slide

Work

Question

A force of $(3 \hat{i} + 4 \hat{j})$ Newton acts on a body and displaces it by $(3 \hat{i} + 4 \hat{j}) m .$ The work done by the force is

Moderate

A

10 J
B

12 J
C

16 J
D

25 J

Solution

$W = \vec{F} . \vec{s} = (3 \hat{i} + 4 \hat{j}) . (3 \hat{i} + 4 \hat{j}) = 9 + 16 = 25 J$

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