An automobile, travelling at 40 km/h, can be stopped at a distance of 40 m by applying brakes. If the same automobile is travelling at 80 km/h, the minimum stopping distance, in metres, is (assume no skidding) :

Question

An automobile, travelling at 40 km/h, can be stopped at a distance of 40 m by applying brakes. If the same automobile is travelling at 80 km/h, the minimum stopping distance, in metres, is (assume no skidding) : (A) 75 m (B) 100 m (C) 150 m (D) 160 m

Tardigrade Admin · Accepted Answer

Given, automobile travelling at 40 km / h can be stopped at a distance of 40 m, then stopping distance =(v2/2 a) ⇒ 2 a=(v2/ text stopping distance ) =((40)2/40 m )=40 Therefore, stopping distance of automobile travelling at 80 km / h is Stopping distance =(v2/2 a)=((80)2/2 a)=((80)2/40)=160 m Thus, minimum stopping distance of automobile travelling at 80 km / h in metres is 160 m.

Q. An automobile, travelling at 40km/h, can be stopped at a distance of 40m by applying brakes. If the same automobile is travelling at 80km/h, the minimum stopping distance, in metres, is (assume no skidding) :

75 m

100 m

150 m

160 m

Q. An automobile, travelling at $40 km / h$ , can be stopped at a distance of $40 m$ by applying brakes. If the same automobile is travelling at $80 km / h$ , the minimum stopping distance, in metres, is (assume no skidding) :