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5.Work, Energy, Power and Collision
easy
A car travelling at a speed of $30\, km/hour$ is brought to a halt in $8\, m$ by applying brakes. If the same car is travelling at $60 \,km/hour$, it can be brought to a halt with the same braking force in ............... $\mathrm{m}$
A
$8$
B
$16$
C
$24$
D
$32$
Solution
(d)$s \propto {u^2}$ i.e. if speed becomes double then stopping distance will become four times i.e.$8 \times 4 = 32m$
Standard 11
Physics
