Simple definition of polar vector on the basis of effects produced

Amother used 150 watts of power to raise a 15 newton object in a time interval of 8.0 seconds. through what vertical distance was the object raised ?

Ionic compounds can be readily dissolved in water because the high dielectric constant of water screens and decreases the force between the oppositely charged ions.

Based on the diagram of the electric field lines around the two spherical charges, what are the signs of the left and right charge respectively?