Which of the following requires the expenditure of more work?(a) Lifting a 90newton [N] weight a height of 5meters [m].(b) Exerting a force of 60pounds-force [lb Subscript f]on a sofa to slide it 30feet [ft] across a room.

Asmall, positively charged ball is moved close to a large, positively charged ball. which describes how the small ball likely responds when it is released? it will move toward the large ball because like charges repel. it will move toward the large ball because like charges attract. it will move away from the large ball because like charges repel. it will move away from the large ball because like charges attract.

If a stone with an original velocity of 0 is falling from a ledgeand takes 8 seconds to hoybthe ground whays the final velocity of the stone

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.