Q. At what point in a waterfall do the drops of water contain the most kinetic energy ? 1.When they are halfway to the bottom

2.When they reach the bottom of the fall

2.When they reach the bottom of the fall

Explanation:

The potential energy of the waterfall is maximum at the maximum height and decreases with decrease in height. Based on the law of conservation of mechanical energy, as the potential energy of the water fall is decreasing with  decrease in height of the fall, its kinetic energy will be increasing and the kinetic energy will be maximum at zero height (bottom of the fall).

Thus, the correct option is "2" When they reach the bottom of the fall

i think they are all correct

explanation:

they seem good

the doppler effect is used by weather forecasters to measure 

moving clouds