Study speed - time graph of a car below and answer following questions (a) What type of motion is re

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7. MOTION

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Study the speed$-$time graph of a car below and answer the following questions

$(a)$ What type of motion is represented by $OA$ ?

$(b)$ Find acceleration from $B$ to $C$.

$(c)$ Calculate the distance covered by the body from $A$ to $B$.

Option A

Option B

Option C

Option D

Solution

$(a)$ Uniformly accelerated motion.

$(b)$ Acceleration is given by the slope of speedtime graph, i.e., $a=(0-60) /(80-60)$ $=-3 m s ^{-2}$

$(c)$ Distance covered is equal'to the area under the speed-time graph, therefore,

$S=60 \times(60-20)=2400 m$

Standard 9

Science

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