10%) Problem 7: A young 45 kg ice hockey goalie, originally at rest, catches a 0

Question

10%) Problem 7: A young 45 kg ice hockey goalie, originally at rest, catches a 0.155 kg hockey puck slapped at him at a speed of 35 m/s. In this problem, take the original direction of the puck as positive ? 50% Part (a) Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. What would the final velocity of the puck, in meters per second, be in this case? ? 50% Part (b) Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. What would the final velocity, in meters per second, of the goalie be in this case?

Explanation / Answer

given that

m1 = 0.155 kg

u1 = 35 m/s

m2 = 45 kg

u2 = 0 m/s

a)
Final velocity after collision,the velocity of puck is v1 = (m1-m2)*u1/(m1+m2) = (0.155-45)*35/(0.155+45) = -34.75 m/s

b) v2 = 2*m1*u1/(m1+m2) = 2*0.155*35/(0.155+45) = 0.24 m/s

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