A boy of mass 20kg stands on a building floor 12m above the ground level. Calculate potential energy.
PE = mgh
so plug in your numbers
.... assuming defining zero at ground level.
To calculate the potential energy of the boy, we can use the formula:
Potential Energy = mass * height * gravitational acceleration
In this case, the mass of the boy is given as 20 kg, and the height is 12 meters. The value of gravitational acceleration on Earth is approximately 9.8 m/s².
Plugging in these values into the formula, we get:
Potential Energy = 20 kg * 12 m * 9.8 m/s²
Simplifying the calculation, we have:
Potential Energy = 2352 Joules
Therefore, the potential energy of the boy is 2352 Joules.
To calculate the potential energy of the boy, we can use the equation:
Potential Energy = mass × gravity × height
Given:
Mass (m) = 20 kg
Gravity (g) = 9.8 m/s^2 (approximate value on the surface of the Earth)
Height (h) = 12 m
Substituting these values into the equation, we get:
Potential Energy = 20 kg × 9.8 m/s^2 × 12 m
Potential Energy = 2352 J (Joules)
Therefore, the potential energy of the boy is 2352 Joules.