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Question

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

Moderate

Solution

$s \propto u^{2}$ i.e. if speed becomes double then stopping distance will become four times i.e. $8 \times 4 = 32 m$

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