A car moving with a velocity of $10 \,m/s$ can be stopped by the application of a constant force $F$ in a distance of $20\, m$. If the velocity of the car is $30\, m/s$, it can be stopped by this force in......$m$
- A$6.67$
- B$20 $
- C$60 $
- D$180$
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- [AIIMS 2001]
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