Question

. An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s. What will be the
velocity after 7 sec

Answer 1

Velocity=70ms^-1

u = 0 m/s; s = 20 mt = 2 s

We use the formula s = ut + (1/2)at^2

Substituting the values, we get

a = 10 m/s2

 

At t = 7 seconds

v = u + a t ,

→ v = 0 + a t

      = 10 x 7  

→ v = 70 m/s