Which of these is not a conservative force and does not have a form of potential energy connected with it?
electric attraction and repulsion
gravity
friction
magnetic attraction and repulsion

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

What is the single most important equation in all of physics?