What are electric motors?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Aclarinetist, setting out for a performance, grabs his 3.350 kg clarinet case (including the clarinet) from the top of the piano and carries it through the air with an upward force of 24.65 n. find the case's vertical acceleration. indicate an upward acceleration as positive and a downward one as negative.

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?