A -50 nC charged particle is in a uniform electric field E = (30 V/m , east). An external force moves the particle 3.0 m north, then 6.0 m east, then 6.0 m south, and finally 5.0 m west. The particle begins and ends its motion with zero velocity.

a) How much work is done on it by the external force?

b) What is the potential difference between the particle's final and initial positions?

the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.