First slide

Work

Question

If a force $\vec{F} = 4 \hat{i} + 5 \hat{j}$ causes a displacement $\vec{s} = 3 \hat{i} + 6 \hat{k}$ , work done is

Easy

Solution

$W = \vec{F} . \vec{s} = (4 \hat{i} + 5 \hat{j} + 0 \hat{k}) . (3 \hat{i} + 0 \hat{j} + 6 \hat{k}) = 4 \times 3 = 12 units$

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