Question

a car moves from rest accelerated of 4m/s2 for 30 seconds and brakes were applied to car comes to rest in next 60 sec find the magnitude of retardation of car

Answer 1

Explanation:

u=0

a=4m/s^2

t=30s

v=u+at

v=4 x 30

v=120 m/s

now lets consider this as u for the next case

u=120m/s

v=0

t=60s

v=u+at

0=120+60a

-120=60a

a=-2

the retardation is of 2m/s^2

Answer 2

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