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  4. The speed-time graph for a body moving along a straight line is shown in figure. The average acceleration of body may be

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Q. The speed-time graph for a body moving along a straight line is shown in figure. The average acceleration of body may bePhysics Question Image

Motion in a Straight Line

Solution:

The acceleration from zero to $5\, s$ is
$a=\frac{0-20}{5-0}=\frac{-20}{5}=-4\, ms ^{-2}$
From $5\, s$ to $10\, s$
$a=\frac{20-0}{10-5}=4\, ms ^{-2}$
$a=\frac{\text { Total change in velocity }}{\text { Time }}$
$=\frac{20-20}{10-0}=0\, ms ^{-2}$

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