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7. MOTION
medium
The velocity$-$time graph of a truck is plotted below
$(a)$ Calculate the magnitude of displacement of the truck in $15$ seconds.
$(b)$ During which part of the journey was the truck decelerating ?
$(c)$ Calculate the magnitude of average velocity of the truck.
Option A
Option B
Option C
Option D
Solution
$(a)$ Displacement $=$ area under the velocitytime graph, therefore, we Kave
$=\frac{1}{2} \times 5 \times 4+(12-5) \times 4+\frac{1}{2} \times(15-12) \times 4$
$=44 m$
$(b)$ During $12$ to $15$ second.
$(c)$ $V _{a v}=\frac{\text { displacement }}{\text { time }}=\frac{44}{15}=2.9 m s ^{-1}$
Standard 9
Science
