Question

.A ball of mass 2kg is moving with a velocity 6m/s collides with other ball of mass of 4kg moving with 3m/s in the same direction . The common velocity of the objects if they move together after collisionRequired to answer. Single choice.

(1 Point)

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Answer 1

AnS:

Net momentum before collision is 2kg×3m/s+(−1kg×4m/s)=2Kgm/s, negative sign because in opposite direction.

After the collision the get stuck to each other so the mass becomes 1+2=3kg  

if the new velocity is v then the new momentum should be  equal to the old one, so 3v=2 or v=  

3

2

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m/s in the  

direction of original direction of 2kg