An automobile travelling with a speed of 60 km/h, can brake to stop within a distance of 20 m. If the car is going twice as fast, ie. 120 km/h, the stopping distance will be
Text Solution
Verified by ExpertsThe correct answer is:
D
The braking retardation will remain same and assumed to be constant, let it be a From 3rd equation of motion,
v 2 = u 2 + 2as
Ist case 0 = 
– 2a × s 1
s 1 = 
2nd case 0 = 
– 2a × s 2
s 2 = 
∴ 
= 
s 2 = 4s 1 = 4 × 20 = 80 m.
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