Question

a car is retarded by applying brake or at the rate of 2m/s it is finally stopped in 10 second find its initial velocity

Answer 1

Hi there !!

Acceleration = a= -2 m/s²

Time = t= 10 secs

Initial velocity = u

Final velocity = v = 0

equation of motion :-

v = u+at

So,

0 = u+(-2 x 10)

u = 2 x 10

= 20 m/s

Initial velocity = 20 m/s

Answer 2

20m/s is the initial speed