Question

if train of length 200cm moving with constant velocity takes 10 sec to cross an electric pole, then the time taken cross an bridge of 400m is ?​

Answer 1

$\mathfrak{ \huge{ \red{ \underline{ \underline{Answer}}}}}$

• Given :

=> A train of length 2m taked 10s to cross an electric pole...

• To Find :

=> Time requires to cross an bridge of length 400m...

• Formula :

=> Velocity(v) of a particle in forms of displacement(d) and time(t) is given as..

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \boxed{ \pink{ \bold{v = \frac{d}{t}}}}$

• Calculation :

=> velocity of train v = 2/10 = 0.2 m/s

=> with the help of this constant velocity time requires to cross a bridge..

=> t = d/v = 400/0.2 = 2000s

$\blue{ \huge{ \star}} \: \boxed{ \boxed{ \red{ \bold{time = 2000 \: s}}}} \: \blue{ \huge{ \star}}$