Question

ums on do object of mass 2kg 3 Sliding with a velocity of Stet coding feste necessary to stop the object in 1km​

Answer 1

Net momentum before collision is 2kg×3m/s+(−1kg×4m/s)=2Kgm/s, negativesign 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=32m/s in the 

direction of original direction of 2kg

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