A car moving with a velocity of 10 ,m/s can be stopped by application of a constant force F in a dis

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2.Motion in Straight Line

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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$180$

Solution

(d) $S \propto {u^2}$.
If $u$ becomes $3$ times then $S$ will become $9$ times
i.e. $9 \times 20 = 180\,m$

Standard 11

Physics

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