(890) Problem 5: A young 44-kg ice hockey goalie, originally at rest, catches a

Question

(890) Problem 5: A young 44-kg ice hockey goalie, originally at rest, catches a 0.16-kg hockey puck slapped at him at a speed of 37 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? Grade Summarv Deductions Potential 0% 100% sin0 cotanasin acos0 atanO actan sinhO coshOtanh cotanh0 cos tan Submissions Attempts remaining: 16 (090 per attempt) detailed view 096 0% 0% 0% END Degrees Radians Submit Hint I give up! Hints: 00% deduction per hint. Hi ints remaining: 2 Feedback: 0% deduction per feedback. 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

a) vf,2 = (m1-m2)*u1/(m1+m2)

given that m1 = 0.16 kg

m2 = 44 kg

u1= 37 m/sec

then

Vf,2 = (0.16-44)*37/(0.16+44) = -36.73 m/sec

b) vf,1 = (2*m1*u1)/(m1+m2)

Vf,1 = 2*m1*u1/(m1+m2) = (2*0.16*37)/(0.16+44) = 0.268 m/sec

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