At 15 m above the ground, the building block has a potential energy of 1500 kJ. What is its mass equal to?

These tasks: h (height above the ground where the building block is located) = 15 m; Ep (potential energy of the building block) = 1500 kJ (1500 * 103 J).

Reference data: g (acceleration due to gravity) ≈ 10 m / s2.

The mass of the building block can be expressed from the formula for calculating the potential energy: En = m * g * h, whence m = En / (m * g).

Let’s make the calculation: m = 1500 * 103 / (15 * 10) = 10 * 103 kg (10 tons).

Answer: The mass of the building block is 10 tons.