For the purpose we will use the following equation for potential energy:
U = m * g * h
In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9.8 N/kg on Earth).
When we plug values into the equation, we get following:
U= 65.7kg * 9.8 N/kg *135m = 86921.1 J = 86.92 kJ
The formula (ma = F - Fg) is used to determine the net upward force acting on a body.
<h3>
What is net upward force acting on a body?</h3>
The net upward force acting on a body is the resultant or sum of all the upward forces acting on a body at a given time.
ma = F - Fg
where;
- F is the applied force
- Fg is the force of gravity
- ma is the resultant force
Thus, the formula (ma = F - Fg) is used to determine the net upward force acting on a body.
Learn more about force here: brainly.com/question/12970081
#SPJ1
The answer is a B Light wave can travel in a vacuum and travel at a contest speed even if the light source is moving