An open water tight railway wagon of mass 5 t | vedclass

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Question

Given, Initial mass of wagon, $m=5 	imes 10^{3} k g$

Initial velocity of wagon, $v=1.2 \mathrm{ms}^{-1}$

After collecting rain drops the mass o

Vedclass · Accepted Answer

$1$

Vedclass · Answer

Given, Initial mass of wagon, $m=5 	imes 10^{3} k g$

Initial velocity of wagon, $v=1.2 \mathrm{ms}^{-1}$

After collecting rain drops the mass of wagon becomes

$m^{\prime}=m+10^{3} k g=6 	imes 10^{3} k g$

Let, $v^{\prime}$ be the velocity of the wagon after collecting rain drops. Wagon is moving without friction on a railway track, thus momentum will remain conserved, hence,

$m v=m^{\prime} v^{\prime}$

$v^{\prime}=\frac{m v}{m^{\prime}}$

$v^{\prime}=\frac{5 	imes 10^{3} 	imes 1.2}{6 	imes 10^{3}}$

$v^{\prime}=\frac{5 	imes 1.2}{6}=1 m s^{-1}$

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