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 (assu

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)

TestHub · Accepted Answer

According to question, u 1 ​ = 40 km / h , v 1 ​ = 0 and s 1 ​ = 40 m using v 2 − u 2 = 2 a s ; 0 2 − 4 0 2 = 2 a × 40 ..(i) Again, 0 2 − 8 0 2 = 2 as From eqn. (i) and (ii) Stopping distance, s = 160 m

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