Formula use:

v=u+at

#### Explanation

*Given,*

Initial Velocity (u) = 45\ km/hr

Acceleration (a) =20\ cm/{sec}^2

Time (t) = 25\ sec

Now , 1st covert the value of initial velocity “km/hr” to “m/sec” .

Initial Velocity (u) = 45\ km/hr

\rightarrow 45\times\large\frac{5}{18}\normalsize\ m/sec

\rightarrow12.5\ m/sec

Acceleration (a) =20\ cm/{sec}^2 or 0.2\ m/s^2 _{[100cm=1m]}*Now,*

v=u+at

\rightarrow v=12.5+\left(0.2\times25\right)

\rightarrow v=12.5+5

\therefore v=17.5\ m/s *So that,* its velocity will be 17.5\ m/s after 25 seconds.**Ans:** Final velocity (v)\ =\ 17.5\ m/s\ .