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Mass of the weight is 10 grams

Mass of the pulley is 34 grams and has a diameter of 49mm

Distance above ground is 1.4m and the time taken is 3.4secs

I know this is an energy problem i.e P.E goes to K.E and i think the Inertia (I) of the pulley is I=mr^2. Were m is the mass of the pulley and r is the radius of the pulley.

At the start i've got the potential energy of the weight but after that i'm stuck and can't figure out how to calculate the mass of the trolley. Hope someone can help every time i do it the mass of the trolley ends up at like 2700grams which i know is wrong.

Thanks in advance James