marcy pulls a backpack on wheels down the 100-m hall. The 60-N force is applied at an angle of 30 above the horizontal. How much work is done by Marcy

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car