Refer to the following information for the next four questions.

A ball gains 30 J of potential energy when lifted to the top of a vertical post.

A massive steel container in initially lifted to a position directly above a post that needs to be driven into the ground.

A pendulum is initially displaced to a height **h** where it has 10 J of potential energy. After it is released, specify the amount of kinetic energy that it will have at each of the following positions in its swing.

A ball is released from rest at the top of a semi-circular ramp. Identify the missing quantity of energy where specified.

If a car, when moving at 30 km/hr, has 1 x 10^{6} J of kinetic energy, how much kinetic energy would it have if it doubled its speed to 60 km/hr? tripled its speed to 90 km/hr?