First slide

The 3 equation for uniform acc

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

$v^{2} = 2 a s s t o p p i n g d i s \tan c e i s p r o p o t i o n a l t o u^{2} \frac{s_{1}}{s_{2}} = {(\frac{u_{1}}{u_{2}})}^{2} = \frac{1}{9}$

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