Impulse and Momentum Theorem 
Impulse is known as the change in momentum of any object: j = Δp 
Momentum is a product of the mass & the velocity of an object, and is a vector quantity: 
It can be shown as p = mv 
This in daily routine life we usually can not notice an object''s mass change because of its velocity changes. 
The change in momentum is shown by equation: 
Δp = mΔv 
Impulse occurs dure to force is applied to an object over period of time: which is shown as equation j = F Δ t 
Thus shown  j =  Δ p,  F Δ t = m Δ v, F = m Δ v/ Δ t 
Newton''s Second Law of Motion is force,  the rate of change of momentum: 
F = Δp/t 
Example Momentum Problem 
Calculate momentum of an object with m=2.00 kg & v-40.0 m/s? 
Answer to Example Momentum Problem 
p = mv =  (2.00)(40.0) = 80.0 kg*m/s