Question

the velocity acquired by a body moving with uniform acceleration is 30m/s in 2s and 60m/s in 4s. the initial velocity is

Answer 1

for first case let us take the motion of carfrom 30 m/sec in 2 sec to 60 mts/sec in 4 secs

​u=30mts/sec

v=60mts/sec

t=4-2 =2 secs

​v=u+at

60=30+2a

a=15mts/sec2
since it is uniform accelaration this is the accelaraion for the whole motion

now we will take whole motin

v=60mts/sec

u=?

a=15mts/sec2
t= 4 secs

v=u+at

60=u+15x4

​u=0 mts/sec