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Question

A sports car can accelerate uniformaly to a speed of 162 km/h in 5 sec. Its maximum breaking retardation is 6 m/s2. Minimum time in which it can travel 1 km starting from rest and ending at rest in seconds is?

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Solution


By v=u+at162×518=a×5
a=9 m/s
Area under the graph is the displacemet. Threfore,
1000=12×t×v0(1)
Applying v=u+at from 0 to t0 sec,
v0=9t0(2)
Applying v=u+at from t0 to t sec,
v0=6(tt0)(3)
By (1) (2) & (3),
t = 23.57 s

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