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7. MOTION
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The graph given below is the distance$-$time graph of an object.
$(i)$ Find the speed of the object during first four seconds of its journey.
$(ii)$ How long was it stationary ?
$(iii)$ Does it represent a real life situation ? Justify your answer.

Option A
Option B
Option C
Option D
Solution
$(i)$ $\frac{(75-0)}{(4-0)}=\frac{75}{4}=18.75 m s ^{-1}$
$(ii)$ $(14-4)=10 s$
$(iii)$ No as distance cannot decrease with time.
Standard 9
Science
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