The Mechanical energy is the same as the Gravitational potential energy at point A because mechanical energy is another word for potential energy.
The Mechanical energy is the same as the gravitational potential energy at point A because Kinetic energy is 0 and GPE + 0 = GPE.
The Mechanical energy is 0 because kinetic energy is zero and mechanical energy is another word for kinetic energy.
The Mechanical energy is 0 because the cart is not moving yet and mechanical energy has to do with movement. i
