Final answer:
The cinder block has gravitational potential energy which is calculated using the formula GPE = mgh. With a mass of 10 kg and a height of 20 m, the block has 1960 joules of potential energy.
Step-by-step explanation:
The cinder block sitting on a platform has gravitational potential energy (GPE) because of its height and mass. The formula for calculating gravitational potential energy is GPE = mgh, where m is the mass of the object, g is the acceleration due to gravity (9.8 m/s2), and h is the height above the ground.
In this case, m = 10 kg, g = 9.8 m/s2, and h = 20 m. Plugging these values into the formula, we get:
GPE = 10 kg × 9.8 m/s2 × 20 m = 1960 joules.
Therefore, the cinder block has 1960 joules of potential energy.