Since acceleration (a) is equal to Δv/Δt you can replace the acceleration (a) in Newton's Second Law of Motion with Δv/Δt to get
F = (mΔv)/Δt
To get rid of the fraction (or division), you can multiply both side with Δt and then the equation will become
FΔt = mΔv
mΔv = m(v2 - v1) = mv2 - mv1, and since {mv2 = P2} and {mv1 = P1}
then FΔt = mΔv = P2 - P1
we can now conclude that
J = FΔt, J = mΔv, or J = P2 - P1 !!!F = Force, m = mass, a = acceleration v = velocity/speed P = momentum
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