I don\'t understand this problem. The sample on this site makesno sense. Can som

Question

I don't understand this problem. The sample on this site makesno sense. Can someone help? Thanks!
Two friends, Al and Jo, have a combined mass of 146 kg. At an iceskating rink they stand close together on skates, at rest andfacing each other, with a compressed spring between them. Thespring is kept from pushing them apart, because they are holdingeach other. When they release their arms, Al moves off in onedirection at a speed of 0.529 m/s, while Jo moves off in theopposite direction at a speed of 1.23 m/s. Assuming that frictionis negligible, find Al's mass. I don't understand this problem. The sample on this site makesno sense. Can someone help? Thanks!

Explanation / Answer

using momentum and that for every force is an equal and oppositereaction states both have the same momentum so ma*Va=mj*Vj ma+mj=146kg solving these equations gives ma*Va=(146-ma)*Vjma=(146*Vj)/(Va+Vj) ma=102.092kg then 146-102.092=43.08kg=mj

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