F we move a positively charged particle through an electric field, in which situation is our work negative?

a)We move the particle in the direction of the electric field.

b)We move the particle in the direction opposite that of the electric field.

c) We move the particle perpendicularly to the direction of the electric field.

2)We move a charged particle through an electric field. In which case is the change in the particle

answer: the answer is a

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me