A particle of mass m is dropped from a height h above the ground. Simultaneously another particle of

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A particle of mass m is dropped from a height h above the ground. Simultaneously another particle of the same mass is thrown vertically upwards from the ground with a speed of 2gh. If they collide head-on completely inelastically, then the time taken for the combined mass to reach the ground is
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How can u conserve momentum because external force mg ( gravity) is acting on two particles

varnitchauhan-studysuccess
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Sir but h toh do he the n jo ki cancel bhi ho gaye toh √h/2g me h kaha se aaya?

dangerderagen
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But why are we conserving momentum considering final speeds of the balls particularly? Why not their initial velocities equal to combined mass velocity?

Aisa kyu hai ki Va Vb hee chahiye… ua ub mei kya dikkat hai

gaurika_