How much gravitational potential energy would be gained by an object moved 3.0 m horizontally?
a. 0.0 J b. 3.0 J c. 9.8 J d. 29 J

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.

Aballet student who learns with the of his instructor is demonstrating learning.

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?