A rock with a Weight of 156.8 newtons falls 5 meters. What potential energy does it have left before the end of its fall?
Where? The end of the fall is at the bottom. exactly where do you mean before?
It loses 156.8 x 5 = 784 Joules of PE (potential enerry) during the fall.
It doesn't make sense to ask how much is left, since it depends upon the elevation you define zero P.E. to be. That is arbitrary. Only changes in PE matter.
We get a lot of senseless quetions here. Blame the schools.
its going to be PEg = mgh = FgH
so 156.8 x 5 x 9.8 = 7683.2
(9.8 m/s^2 is the acceleration due to the gravity of earth)
To calculate the potential energy of an object, we can use the formula: Potential energy = weight * height.
Given that the weight of the rock is 156.8 newtons and it falls 5 meters, we can plug those values into the formula as follows:
Potential energy = 156.8 newtons * 5 meters
To find the potential energy, we simply multiply the weight by the height:
Potential energy = 784 newton-meters (also known as joules)
So, the rock has 784 joules of potential energy left before the end of its fall.