Question

Starring from rest Rohan pressed the accelerator of his car to attain a velocity of 12 m / s in 30 s then he applies brakes such that the velocity of the car comes down to 8 m / s in the next 5 s. Calculate the acceleration of the car in both the cases

Answer 1

u =0
v = 12m/s
t = 30s
a=?

1st case

a = (v - u) / t

= (12 - 0) / 30

= 12/30 = 0.4m/s^2

2nd case

u = 12m/s
v = 8
t = 5s
a=?

a = (v - u) / t

a = (8 - 12) / 5

a = - 0.8m/s^2


Thanks