Question

find acceleration of an object more with velocity 20m/s comes to rest at 5 sec after application of brakes​

Answer 1

Answer:

u = 20 m/s

v = 0 m/s (comes at rest)

t = 5 sec

using eq.

v = u + at

0= 20 + a × 5

-20 = 5× a

-20/5 = a

-4 = a

So acc. will be -4

it is negative because it is the retardation force.