Question

An object started from rest accelerates at a rate of 3 m/s. Find i) velocity after 5 seconds ii) time to gain a speed of 36 m/s

Answer 1

Answer:

1)15 m/s

2)12sec

Explanation:

1) we know that v=u+at

body starts from rest so u=0 m/s and a=3mls²and t=5sec

v=0+3×5

v=15m/s

2)lly,.

v=36m/s and t=?

v=u+at

36=0+3×t

t=12sec

Answer 2

a= 3m/s^ 2

u=0 m/s

v= u + at

= 3 x 5

v = 15 m/s

s = at^2

36 = 3t^2

t^2 = 24

t= 2√6 s