p09_024.pdf

(77 KB) Pobierz

Chapter 9 - 9.24

24. (a) Since the force of impact on the ball is in the y direction, p x is conserved: p xi = mv i sin30 ◦ =

p xf = mv i sin θ .Thus θ =30 ◦ .

(b) The momentum change is

∆ p = mv i cos θ (

−

ˆ j)

−

mv i cos θ (+ ˆ j)

−

2(0 . 165kg)(2 . 00m / s)(cos30 ◦ ) ˆ j

−

0 . 572 ˆ jkg

m / s .