Finding out the mass of an object given only height

[DPXJube]

Homework Statement

A roller coaster starts at rest from a height of 110m and accelerates down the track to a height of 10.0 m. Find the speed it can each, assuming there is no friction

Homework Equations

Eg = mgh
v = sqrt(2Ek/m)

The Attempt at a Solution

Honestly I'm not sure where to begin when given no mass.

 

[rock.freak667]

Hi DPXJube,

How about we try applying the law conservation of energy here. (it might involve mass in the beginning but write it out )

 

[Borek]

Assume mass of m, solve using symbols only. Prepare for a surprise.