I need help on my physics homework. I don't understand any of these. Please give step by step instructions.

Potential Energy 1. A 25.0 N object is held 2.10 m above the ground. What is the potential energy with respect to the ground? The bob of a pendulum has a mass of 2.0 kg and hangs 0.50 m above the floor. The bob is pulled sideways so that it is 0.75 m above the floor. What is its potential energy with respect to its equilibrium position? 2. An uncompressed spring is 20.0 cm in length. What is the potential energy of the spring when an average force of 65.0 N compresses it to a length of 13.5 cm? 5. 6.0 m 12.0 m 3. 10.0 m 7.00 m A 2.00 x10' kg crate is pushed to the top of an incline as shown. If the force A 2.75 kg box is at the top of a applied along the incline is 12000 N, frictionless incline as shown in the what is the potential energy of the object diagram. What is the potential energy when it is at the top of the incline with with respect to the bottom of the incline? respect to the bottom