Physics: An empty train car of mass 2.0 x 10^4 kg coasts along at 10 m/s. a 3000-kg boulder is suddenly dropped vertically into the car. find the speed of the car immediately after the boulder is dropped.

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An empty train car of mass 2.0 x 10^4 kg coasts

gallegosarmanni

13.01.2022

8.69 m/s

Explanation:

Given

mass of Empty train $m=2\times 10^4 kg$

velocity of car v=10 m/s

mass of Boulder M=3000 kg

Since no External force is acting therefore conserving Momentum

Train and boulder moves with same velocity after collision

m v=(M+m)v'

$2\times 10^4\times 10=(2\times 10^4+3000)v'$

$v'=\frac{20,000\times 10}{23000}$

v'=8.69 m/s

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