Question

2. How long will a train 450 m long travelling at 45 km per hour take to cross a tree?
​

Answer 1

Answer:

$\sf 45kmph=45× \frac{5}{18} =12.5m/s</p><p></p><p>$

$\sf \: total \: length \: covered \: by \: train=850m+150m=1000m</p><p></p><p>$

$\sf \: velocity= \frac{dispacement}{time} </p><p></p><p></p><p>$

$\sf \: t= \frac{s}{v}$

[tex] \sf \: t= \frac{

1000m

}{

(12.5m/s)

}

[tex] \sf t=80