A standard for comparison is called a frame of reference
True or False​

How is acceleration calculated? a. initial velocity - final velocity / timeb. initial velocity + final velocity / timec. final velocity - initial velocity / timed. final velocity / timele select the best answer from the choices provided0oood00save and exitnextmark this and return

Coal contains energy. a. light b. kinetic c. chemical d. mechanical

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.