Which action would require no work to be done on an object? a

Decreasing the speed of the object until it comes to rest.

b

Pushing the object along a horizontal floor against a frictional force.

c

Lifting the object from the floor to the ceiling.

d

Holding the object stationary above the ground.

PLEASE HELP

The dot diagram represents the motion of the motorcycle as it moves from left to right

In what direction does an applied force move an object

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?