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An automobile travelling with a speed 6...

An automobile travelling with a speed `60 km//h` , can brake to stop within a distance of `20 m` . If the car is going twice as fast i. e. , `120 km//h`, the stopping distance will be

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Since, stopping distance `a u^(2), ? (s^(2))/(s_(1)) =((2u)^(2))/(u^(2)) =4" or "s_(2) =4s_(1) = 4xx20 m =80 m`
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