Question

Two cars 1 & 2 starting from rest are moving
with speeds, v1 and v2 m/s (v1>v2). Car 2 is
ahead of car '1' sees car '2'.what minimum retardation should be given to car '1' to avoid
collision​

Answer 1

Answer:

(v1 - v2)2/2 s

Explanation:

t=v2 - v1/a

after time t distance will be

d=v2t-(v1t- 1/2 at2)

The maximum value of d is possible s d greater than s

1/2(v2 - v1)2÷a greater than s

a is greater than ( v1- v2)2÷2s