Question

g
O. A truck is moving forward at a constant speed of
20 m/s. The driver sees a stationary car directly ahead
at a distance of 110 m. After a 'reaction time' of At, he
applies the brakes, which gives the truck an
acceleration of 2 m/s2. The maximum allowable
reaction time to avoid a collision is
(1) 1.5 s
(2) 0.5 s
(3) 2.0 s
(4) 1 s​

Answer 1

Answer:

Answer is 2

Explanation:

first take out the stoping distance () then subtract it from 110 i.e 10 we know that velocity is 20 m/s so

20t=10

t=0.5 ans