Four balls are dropped from a platform, 20 meters high. which ball will experience the greatest change in kinetic energy, from platform to ground?
10 kg
20 kg
30 kg
40 kg

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

Since the energy was not raising the temperature of the water during these segments, what was the energy used to do instead? your answer must include an explanation of what is happening to the molecules.