Momentum and CollisionMediumBloom L3
Question
An open water tight railway wagon of mass 5 × 103 kg coasts at an initial velocity 1.2 m/s without friction on a railway track. Rain drops fall vertically downwards into the wagon. The velocity of the wagon after it has collected 103 kg of water will be
Options
A.0.5 m/s
B.2 m/s
C.1 m/s
D.1.5 m/s
Solution
Sol. (Fext)H = 0 ∴ rain falls vertical
∴ 5 × 103 × 1.2 = 6 × 103 × v
⇒ v = 1.0 m/s
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