Select the words that make the sentence a true statement.
the harder a person hits a tennis ball, the faster it moves. why does the ball move faster?

the acting on the ball is

1. friction or force
2. the same or greater or smaller

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?

In science and physics what is the standard unit of measure for speed?

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?