Question

2-3

2. 0/6.66 points Previous Answers SerPSE10 9.1.P.003. My Notes Ask Your Teacher A baseball approaches home plate at a speed of 49.0 m/s, moving horizontally just before being hit by a bat. The batter hits a pop-up such that after hitting the bat, the baseball is moving at 58.0 m/s straight up. The ball has a mass of 145 g and is in contact with the bat for 2.40 ms. What is the average vector force the ball exerts on the bat during their interaction? (Let the +x-direction be in the initial direction of motion, and the +y-direction be up.) Fon bat - 4587 XN Need Help? 3. -16.66 points SerPSE10 9.2.OP.003.MI. My Notes + Ask Your Teacher A 44.2-kg girl is standing on a 153-kg plank. Both originally at rest on a frozen lake that constitutes a frictionless, flat surface. The girl begins to walk along the plank at a constant velocity of 1.42î m/s relative to the plank. (a) What is the velocity of the plank relative to the ice surface? cî m/s (b) What is the girl's velocity relative to the ice surface? C îm/s Need Help? Read It Master le

Answer 1

@ mass of the ball (m) = 1459 = 0.145 kg. initial speed (a) = 491 m/s final speed (P) = 58 3 m/s contact time cat) = 2.4oms = 24 X10 % change in momentum CAP = BP = mc2-u) = 0.145 (585 - nail) Avereage force (F) = DP - 0.145 x 58 5" _ 0.145x49 7 R.4 x103 2-4 X103 = (3.50425 - 2.9604 ) x 10 (-2.9600? +3.50up jt) x 10 re.) So P= mass of girer (mida uu.2 kg mass of Plank (m₂) = 153 kg Girls velocity củ ) = 1 Ri , Conservation of momentum (a) Principle, mu+muz=0 ūs = - 04.2x1.471 = -0.41022imis W = -0.41022 I'M 153 (6) Girds velocity relative to ground u=lin tuz) = 1.609778 T MYS ® Please rate !