Question

the brakes applied to a car produce a uniform retardation of 1.2 metre per second square. before stopping, the car covers a distance of 12 metre. how long was the brakes applied ?​

Answer 1

Answer:

In this question

u=27m/s

v=0

a =-90

so By using 3rd equation of motion

2as = {v}^{2} - {u}^{2}

2×-90=0-729

1 80s=729

s=729/180

s=4.05m