Question

a car is moving with a velocity of 20 metre per second square comes to rest in 5 seconds what is its retardation?​

Answer 1

Answer:

initial velocity(u)= 20m/s

final velocity (v)= 0m/s

time (t)= 5sec

retardation (-a) = ?

By first equation of motion,

v = u + at

0 = 20 + a(5)

-20/5 = a

a = -4m/s sq

retardation = 4m/s sq

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