As a falling apple, approaches the ground, its potential energy

What are the applications of electromagnetic waves

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a. the kinetic energy increases. b.the kinetic energy decreases. c.the kinetic energy remains the same. d.the kinetic energy is always zero.