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From the displacement-time graph shown here, find the velocity of the body as it moves from \( A \) to \( B \)

1. \( 0.8 \mathrm{m} / \mathrm{s} \)
2. \( 1.2 \mathrm{m} / \mathrm{s} \)
3. \( 10 \mathrm{m} / \mathrm{s} \)
4. \( 20 \mathrm{m} / \mathrm{s} \)

Correct answer: \( 1.2 \mathrm{m} / \mathrm{s} \)

Solution

On a displacement–time graph, the velocity is the gradient of the line. Using the coordinates of A and B, the change in displacement divided by the change in time gives 1.2 m/s.

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