2.Motion in Straight Line
medium

$100 \,m$ લંબાઇ ધરાવતી ટ્રેન $45\, km/hr$ ની ઝડપથી ગતિ કરે છે,$1000 \,m$ લંબાઇ ધરાવતા પુલને પસાર કરવા માટે કેટલા...........$s$ નો સમય લાગે?

A

$58 $

B

$68$

C

$78$

D

$88 $

Solution

(d) Length of train $= 100\, m$ Velocity of train$ = 45\;km/hr = 45 \times \frac{5}{{18}} = 12.5\;m/s$

Length of bridge $= 1 km = 1000 m$ 

Total length covered by train $= 1100 m$

Time taken by train to cross the bridge $ = \frac{{1100}}{{12.5}}= 88 sec$

Standard 11
Physics

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