The driver of a car travelling at velocity v suddenly sees a broad wall in front of him at a distance ‘a’:
A
If the brakes are applied force required to stop the car not to be smashed up with wall is 
B
To avoid crashing with wall if the car turns in circle, then force required is 
C
It is better to apply the brakes than to turn the car in circular path to avoid crashing with wall When car stops then its kinetic energy is expended in work against force of friction
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, b, c, d)
When brakes are applied to avoid crash
By work-energy theorem
W f = Δ K
– fx = 0 – 
x = 
x ≤ a
≤ a
Force required to avoid crash by braking
f ≥ 
If car turns in circle then, force required is
f ≥ 
f ≥ 
Half force is required in braking than in turning the car in circle to avoid crash with the wall.
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