First slide

Different question variety formed

Question

Tripling the speed of a motor car multiplies the distance needed for stopping it by:

Moderate

A

3
B

6
C

9
D

none of these

Solution

Stopping distance $\propto$ (speed)² ( $∵ s = \frac{u^{2}}{2 a}$ ).
Hence when $u' = 3 u$ , for same deceleration $s' = 9 s$ .

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