Motion in One Dimension — PHYSICS STD 9 — Question
ICSE BoardEnglish MediumSTD 9PHYSICSMotion in One Dimension2 Marks
Question
Express the following in $m s^{-1}.$
$1 km h^{-1}$
✓
Answer
$1 km h ^{-1}=\frac{1 km }{1 h }=\frac{1 \times 1000 m }{60 \times 60 s }$
$\Rightarrow 1 km h ^{-1}=\frac{1 \times 10 m }{6 \times 6 s }$
$\therefore 1 km h ^{-1}=\frac{10 m }{36 s }$
$\therefore 1 km h ^{-1}=\frac{0.278 \times m }{ s }$
$\therefore 1 km h ^{-1}=0.278 ms ^{-1}$
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