What is the potential energy in a body of mass 5kg on top of a pole 20metres high ?
9.8 joules
A. 9.8 joules
B. 98 joules
C. 980 joules
D. 0.98 joules
To determine the potential energy in a body, you need to use the formula: potential energy = mass * gravity * height.
In this case, the mass of the body is given as 5 kg, and the height of the pole is 20 meters. The value of gravity is standard and is approximately 9.8 m/s² near the Earth's surface.
Plugging in the values into the formula, we can calculate the potential energy:
Potential energy = 5 kg * 9.8 m/s² * 20 m
= 980 Joules
Therefore, the potential energy in the body is 980 Joules.