Two rocks are at the top of a building. Rock 1 is dropped from rest while Rock 2 is thrown horizontaly at a velocity of 5 ms. What is the magnitude of the horizontal acceleration of rock 2?>
O m/s 2
2 m/s 2
5 m/s 2
10 m/s2

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

What component of earth’s atmosphere exists entirely as a result of photosynthesis?