What is the formula for magnitude of the change in momentum?

Answer 1

For one object

Delta = change

Delta(/\) P(momentum)=/\mv or P=m/\v if mass is constant or P=m(Vf-Vi)

Answer 2

Momentum is a vector. Find the change in momentum first by subtracting the initial momentum vector from the final momentum vector.
(xf - xi)i + (yf - yi)j + (zf-zi)k
Then take the norm of the vector. By taking the root of the sum of squares.
sqrt(dx^2 + dy^2 + dz^2)
This is the magnitude.