Which statement best explains acceleration?

a. it is the total distance covered over a period of time.
b. it is a change in velocity over a period of time.
c. it is a change in displacement over a period of time.
d. it is a change in direction over a period of time.

The answer is b.

Hope that helps :)

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy