Question

a projectile of mass m is fired with velocity v from a point at 30 degree. what is the change in momentum between the first and last point of projection?

Answer 1

mcos30vt-m cos30v
First is final p and second initial p

Answer 2

Answer:

momentum =mv...

as along the horizontal velocity remains constant .

momentum is unchanged ..

therefore all the change in momentum occurs along the vertical..

∆p= final vertical momentum - initial vertical momentum..

∆p= mvsin30 - ( - mv sin 30)..

∆p= 2 mv sin 30

∆p = 2 mv × 1/2

∆ p = mv..

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