First slide

Rectilinear Motion

Question

When the speed of a car is u, the minimum distance over which it can be stopped is s. If the speed becomes nu, what will be the minimum distance over which it can be
stopped during the same time?

Moderate

A

s/n
B

ns
C

s/n²
D

n²s

Solution

$\begin{array}{l} v^{2} - u^{2} = 2 a s, v = 0 \\ s \propto u^{2} \end{array}$
When the initial velocity is made n times, the distance over
which it can be stopped becomes n² times.

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