Question

define Momentum ?? what is its SI unit ??? write down the mathematical expression for Momentum also write down the law of conversation of momentum

Answer 1

Momentum:-
Momentum is a physics term; it refers to the quantity of motion that an object has. A sports team that is on the move has the momentum. If an object is in motion (on the move) then it has momentum. Momentum can be defined as "mass in motion." ... Momentum depends upon the variables mass and velocity.
Si unit of momentum is kgm/s
Mathematical expression
P=mv
Law of conservation of momentum
conservation of momentum. A conservation law stating that the total linear momentum of a closed system remains constant through time, regardless of other possible changes within the system.
P1=p2=m1v1=m2v2
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Answer 2

HIII FRIEND!!

The momentum of a body is defined as the product of its mass and velocity.
Momentum = mass X velocity
p= m x v 

The SI unit of Momentum is kilogram meters per second.
example of momentum can be when a karate player can break a pile of tiles or a slab of ice with a single blow of his hand.

conservation of Momentum = then two bodies act upon one another, their total momentum remains constant provided no external forces are acting. 

Total momentum before collision = total momentum after collision
m1u1+ m2+u2 = m1v1 + m2v2


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