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NTA Abhyas JEE Main2020PhysicsMotion in Two DimensionsPractice

A man throws a ball of mass m from a moving plank ( A ). The ball has a horizontal component of velocity u = 3 34 m s - 1 with respect to ground towards another man standing on stationary plank ( B ), as shown in the figure. The combined mass of plank A with man as well as that of plank B with the other man is 2 m each. the x-y plane represents the horizontal plane which is frictionless. If initially, plank A was mov

Correct answer

7

Step-by-step solution

By conservation of momentum, 3 m u i ^ = m ( u cos 37 o i ^ + u sin 37 o j ^ ) + 2 m V A → = V A → = 11 u 10 i ^ - 3 u 10 j ^ Similarly = V B → = 4 u 15 i ^ + 3 u 10 j ^ ∴ V B A = 17 m s - 1

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