The velocity acquired by a body moving with uniform acceleration is 30m/s in 2 seconds and 60m/s in 4 seconds. The initial velocity is:
Let,
Constant acceleration, a
Initial velocity u
Apply kinematic Equation
v=u+at
a=v−ut
Compare acceleration at both event at time, t1&t2
v2−ut1=v3−ut2
⇒30−u2=60−u4
⇒u=0
Initial velocity u=zero