Changes in motion - Quick question

Ok so i have two velocities in vector form, and the question is wanting its change in speed and in momentum, ive wondered what the actual difference is in this and how you would work out each one? is speed like the numbers squared, then added then square rooted?

Indeed ... The speed is the magnitude of the vector

Ok so what would be the way of working out the momentum? I always get confused

Ok so i have two velocities in vector form, and the question is wanting its change in speed and in momentum, ive wondered what the actual difference is in this and how you would work out each one? is speed like the numbers squared, then added then square rooted?

As stated, the question is asking you to calculate a scalar quantity (change in speed) and a vector quantity (change in momentum). Is this actually how the question is worded?

Question is, A ball of mass 100 grams is hit so it changes its velocity from 4i+3jms-1 to 3i+4jms-1. What is its change in speed and what is change in momentum

And, are you ok with the answer now?

Im pretty sure i know the speed, just a question of the momentum, still not sure how to work that one out, dont seem to remember going through how to work that one out in a lesson