A 2kg stone is dropped from the top of a 20m tall building.What is it's potential energy at this height?
To calculate the potential energy of an object, you need to know the mass of the object (m), the acceleration due to gravity (g), and the height (h) at which the object is located.
In this case, the mass of the stone is given as 2 kg, and the height from which it is dropped is 20 m. The acceleration due to gravity is typically taken as 9.8 m/s².
The potential energy (PE) of an object at a certain height is given by the formula:
PE = m * g * h
Plugging in the values we have:
PE = 2 kg * 9.8 m/s² * 20 m
Now, let's calculate the potential energy:
PE = 2 * 9.8 * 20
= 392 Joules
Therefore, the potential energy of the stone at a height of 20 m is 392 Joules.