For This Question, Assume That All Velocities Are Horizontal and That

question 68

Multiple Choice

For this question, assume that all velocities are horizontal and that there is no friction. Two skaters A and B are on an ice surface. A and B have the same mass M = 90.5 kg. Skater A is initially motionless, and then throws a ball with mass m = 200 g toward B with a speed v = 21.5 m/s relative to the ice. B catches the ball and throws it back to A with the same speed. After A catches the ball, his speed with respect to the ice is

• A) 4.3  10³ m/s.
• B) 4.3 m/s.
• C) 4.8  10^-2 m/s.
• D) 9.5  10^-2 m/s.
• E) 0.34 m/s.

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