Question

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

Answer 1

Now,
at t = 2s, v = 30m/s
at t = 4s, v = 60 m/s
so, acceleration
a = dv / dt = (60-30) / (4-2)
thus,
a = 30/2 = 15m/s

now,
v = u +at
initial velocity will be calculated using
u = v - at
after two seconds
u = 30 - 15 × 2
thus, initial velocity
u = 0m/s.