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7. MOTION
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A car travels $100\, km$ east and then $100 \,km$ south. Finally, it comes back to the starting point by the south-east route. Throughout the journey the speed is constant at $60\, km h ^{-1}$. The average velocity for the whole journey if time taken is $3.3$ hours is
A
$60\, km\, h ^{-1}$
B
$90\, km\, h ^{-1}$
C
$180 \,km \,h ^{-1}$
D
$0 \,km \,h ^{-1}$
Solution
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Standard 9
Science
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