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.

Burning fossil fuels contributes to climate change.

Fossil fuels are nonrenewable.

Explanation:

Fossil fuels are fuels formed from the remains of dead organic matters that have long been buried under the ground while hydrogen fuel cells are formed from electrochemical reactions.

Fossil fuel burning creates pollution in the environment and some of the pollutants generated contribute to global warming and associated climate change. This is as opposed to fuel cells that generate power through electrochemical reactions and whose products can be converted for other uses.

Also, fossil fuel deposits are finite and non-renewable. Once their deposits become exhausted, there is no way to artificially regenerate them unlike fuel cells.

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.