Question

a bus starting from rest moves with a uniform acceleration of 0.2ms for three minutes. find the velocity acquired.

Answer 1

First I write all the data available.

Initial Velocity,  u=0 m/s
Final Velocity,   v=(?)
Acceleration,    a=0.2 m/s²
Time,                 t=3 min = 180 s
 
Now, we know that 

Uniform Acceleration,  a= (v-u) / t
∴at = v-u
∴v = at + u
∴v = 0.2 * 180  + 0
∴v = 36 m/s  or  10 km/h

Thus, velocity of the bus at the end of 3 minutes is 36 m/s.

Answer 2

We know from the equation of motion,
v = u + at
given,
u = 0
a = 0.2 m⁻¹s
t = 3 min = 180 sec

therefore,
v = 0+ 0.2×180
v = 36 m⁻¹s