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7. MOTION
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The following table show os the positon of three persons between $8.00\, am$ to $8.20\, am$.
| Time | Position (in $km$) | ||
| Person $A$ | Person $B$ | Person $C$ | |
| $8.00 \,am$ | $0$ | $0$ | $0$ |
| $8.05 \,am$ | $4$ | $5$ | $10$ |
| $8.10\, am$ | $13$ | $10$ | $19$ |
| $8.15 \,am$ | $20$ | $15$ | $24$ |
| $8.20\, am$ | $25$ | $20$ | $27$ |
$(i)$ Who is moving with constant speed ?
$(ii)$ Who has travelled maximum distance between $8.00\, am$ to $8.05\, am$ ?
$(iii)$ Calculate the average speed of person $'A^{\prime}$ in $k m h^{-1}$
Option A
Option B
Option C
Option D
Solution
$(i)$ Person $B$ is moving with constant speed as he travels equal distance $(5 km )$ in equal intervals of time, i.e., in every $5$ minutes.
$(ii)$ Person $C$. He travelled $10 km$.
$(iii)$ Average speed of person"
$A=\frac{\text { Total distance travelled by } A}{\text { Total time taken }}$
$=\frac{25 km }{20 min }=\frac{25 \times 60}{20} km h ^{-1}$
$=75 km h ^{-1}$
Standard 9
Science
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