an object falls freely from rest near the surface of earth. what is the speed of the object after having fallen 4.9 mters

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.