Question

an object starts from rest and attains a velocity of 90km/h in 5 s find its acceleration​

Answer 1

Acceleration = {v - u }/t

(v = final velocity, u = initial velocity, t = time)

According to question :-

Object starts from rest

u = 0

v = 90km/h = 90 x 5/18 = 25m/s

t = 5s

Acceleration = {25 - 0}/5

= 5m^2