100k points pls solve asap or no points

Explanation:

You have given us a very weird question. Things do not mesh

If the mass is 500 kg and sits 25 m above the lowest spot on the track, the potential energy is

PE  = mgh = 500(9.8)(25) = 122500 Joules,

not the reported 61250 Joules

So either the Joules is incorrect or the mass is supposed to be 250 kg.

In either case, in the absence of friction, the potential energy will convert to kinetic energy.

½mv² = mgh

     v = √2gh

which does not involve the use of either Joules or kilograms.

Maximum velocity when starting from rest is

v = √(2(9.8)25) = √490 = 22.135943...

v = 22 m/s

the closer the planet is to the sun, the larger the gravity