A car moving with a speed of 50 km/h can be stopped by brakes after at least 6m. If the same car is moving at 100 km/h,

Question

A car moving with a speed of 50 km/h can be stopped by brakes after at least 6m. If the same car is moving at 100 km/h, the minimum stopping distance is:

Accepted Answer

Using v^2 = u^2 - 2as, where v = 0, stopping distance d = u^2 / 2a. Since deceleration 'a' is constant, d is proportional to u^2. When speed is doubled (from 50 to 100), stopping distance becomes 2^2 = 4 times. So, 6m 4 = 24m.

Motion in a Straight Line

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