# Can someone check my work please, thank you.

1. Mar 26, 2012

### nesan

Can someone check my work please, thank you. :)

1. The problem statement, all variables and given/known data

A hockey player of mass 85 kg travelling at 15 m/s [N] collides with another hockey player of mass 70 kg at 5.0 m/s [E]. If the two hockey players lock skates during the collision and are held together, find the resultant velocity of the pair. Assume there is no friction.

2. Relevant equations

Ʃinitialρ = Ʃfinalρ

3. Solution, I feel like it is wrong because my answer is 0.2 off what it is in the text book, I have no idea what decimal place they took. :(

(70) * (5) = (155) (v * cosθ)

(85) * (15) = 155(v * sinθ)

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350 = (155) (v * cosθ)

1275 = 155(v * sinθ)

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sqrt((350)^2 + (1275)^2) ≈ 1322.17

1322.17 / 155 ≈ 8.5 m/s [N15°E]

The answer in the text book is 8.3 m/s [N16°E]

Someone check if I'm correct please. Thank you. :)<3

2. Mar 26, 2012

### PhanthomJay

Re: Can someone check my work please, thank you. :)