A 2.0-kg rock falls from a height of 25 m to a point 20 m above the ground.
How much potential energy does it lose?
GIVEN:
mg = 2.0 kg
h/d = 5 m
PE = mgh
PE = (2)(5)
PE = 10 J
NO. PE=mgh
you did not include the value of g.
OK, i was told by my teacher that mg would equal together 2 kg. If your including g then:
PE = mgh
PE = (2)(9.8)(5)
PE = 98 J
To calculate the potential energy lost by the rock, we need to use the formula PE = mgh, where PE represents potential energy, m represents mass, g represents the acceleration due to gravity, and h represents the change in height.
In this case, the mass of the rock is given as 2.0 kg and the change in height is from 25 m to 20 m above the ground.
First, let's calculate the change in height:
change in height = final height - initial height = 20 m - 25 m = -5 m
Now, we can calculate the potential energy lost:
PE = mgh = (2.0 kg)(9.8 m/s²)(-5 m)
PE = -98 J
Therefore, the rock loses 98 Joules of potential energy.