MasteringPhysics: HW7: Momentum Secure https://session.masteringphysics.comn/myc
ID: 2035742 • Letter: M
Question
MasteringPhysics: HW7: Momentum Secure https://session.masteringphysics.comn/myct/itemView?offsetenext&assignmentProblemID-90379497; KHW7: Momentum +Catching a Ball on Ice 5 of 14 If Olaf catches the ball, with what speed uf do Olaf and the ball move afterward? Constants Express your answer numerically in meters per second. Olaf is standing on a sheet of ice that covers the football stadium parking lot in Buffalo, New York; there is negligible friction between his feet and the ice. A frienc throws Olaf a ball of mass 0.400 kg that is traveling horizontally at 11.5 m/s. Olafs mass is 69.1 kg .(Figure 1) View Available Hint(s) 6.62x10-2 m/s Correct Figure 1 of 1 Significant Figures Feedback: Your answer 0.0673 m/s was either rounded differently or used a different number of significant figures than required for this part. ? Part B If the ball hits Olaf and bounces off his chest horizontally at 8.70 m/s in the opposite direction, what is his speed vr after the collision? Express your answer numerically in meters per second. ?View Available Hint(s)Explanation / Answer
a)
initial momentum = final momentum
m1v1 = M*vf (M = 0.400+69.1)
(0.400 kg)(11.5 m/s) = (69.1 + 0.400 kg)(vf)
vf = 0.0662 m/s = 6.62*10-2 m/s
b)
In Part A we saw that the total momentum is (mass * velocity, or 0.400 * 11.5) This will stay the same after the collision. Since the ball will be moving backwards (negative) at 8.70 m/s
(0.400 kg)(11.5 m/s) = (69.1 kg)(vf) + (0.400 kg)(-8.70 m/s)
vf = 0.117 m/s