1. A book is at rest on a tabletop. Diagram the forces acting on the book.

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.

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.