Question

A $150$ m long train is moving with a constant velocity of $12.5m/s.$

Find
(i) The equation of the motion of the train.
(ii) The time taken to cross a pole.

(iii) The time taken to cross the bridge of length $850m$.

Answer 1

Length of train$=150m$.

Constant velocity $v=12.5m/s$

$Speed=\frac{distance}{time}$

i) equation of motion :-

$150=12.5t$

ii) time taken to cross a pole

$t=\frac{150}{12.5}=12\sec$

iii) time take to cross a bridge$=\frac{850+150}{12.5}$

$=80\sec$.