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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 graph
Area $=1 / 2 \times 5 \times 4+7 \times 4+1 / 2 \times 3 \times 4=44 m$
$(b)$ From $12$ to $15$ sec period.
$(c)$ Average velocity $=44 / 15=2.93 m s ^{-1}$
Standard 9
Science
