The mass of the object is 75 kg.
To find the mass of the object, we can use the formula for gravitational potential energy, which is GPE = mgh, where m is the mass of the object, g is the acceleration due to gravity (approximately 9.8
), and h is the height of the object.
In this case, GPE = 4520.25 J, h = 6.15 m, and g = 9.8

So, we can rearrange the formula to solve for m: m = GPE / (g * h) = 4520.25 J / (9.8
* 6.15 m) = 75 kg.