Afootball player pushes against another player trying to block him from moving any farther down the field. which term best describes this example?

negative work
positive work
negative force
positive force

is it b or something else? ? i really need this to be right. you!

Can you use radiation to generate electricity

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Explain the consequences of this addiction to the brain tissue