Question

Mary weighs 466 N and she walks down a flight of stairs to a level 3.5 m below her starting point. What is the change in Mary’s potential energy? Answer in units of J.

Answer 1

Answer: 1,631J

Step-by-step explanation:

Potential energy is the energy possessed by a body by virtue of its position. It is an example of mechanical energy.

Mathematically, P.E = mass×acceleration due to gravity×height

Since Force = mass×acceleration = 466N

Height = 3.5m

Substituting this values in the formula, we have;

P.E = 466 × 3.5

P.E = 1631Joules

Mary's change in potential energy is therefore 1,631Joules