How do you calculate change in momentum?

I need a definition of how you would calculate a change in momentum. Thanks

i was given a task to design an experiment that show photons have momentum using diffraction grating and also to calculate the momentum. The problem is, i'm kind of stuck in confusion here, and the deadline is almost due. photons carry energy and momentum...

I have this really hard homework to do, i've answered most of the questions, but there are some i don't understand. Please answer the questions below ASAP? I will give the best answer a rating. How do you calculate the change in momentum? Write down...

A 12kg ball moving at 2.5m/s collides with a brick wall and rebounds at 1.75m/s. a) Calculate the change in momentum of the ball. Is it: initial: 30kgm/s final: 21kgm/s change in momentum: 30-21 = 9kg m/s ? b) calculate the impulse the ball applies to...

Physics question - involving cars, air, momentum, force, etc... Basically - how can I calculate the side force from a crosswind on my car at any given speed? (Yes, I googled as much as I could and couldn't come up with a formula for this.) First off...

The velocity of a vehicle of mass 600kg was reduced from 15m/s by a constant force of 400N which acted for 20s then by a constant force of 20N for a further 20s. a) sketch the force v. time graph (i can do this) bi) calculate the initial momentum of...