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A roller coaster train is propelled at 57m/s and towards a vertical part of track which has a height of 139m, what is the velocity of the roller coaster train when it reaches the top of the tower?

I got that:

Ek=Ep so

1/2mv^2=mgh so m's cancel so 1/2v^2=gh

so in relation to the questiom

1/2(57)^2=1/2v^2 + gh (because energy is conserved so potential energy must be added)

Then

1624.5=1/2v^2 + 1363.6

290.9=1/2v^2

etc, etc and ended up with 22.84 m/s but i've no idea if this is correct as i've never come across a question like this before. does this seem right? Thanks