Which equation would you use to calculate how much work is done in pushing a rock to the edge of the cliff? A. Ep = w x h
B. Ek = 1/2 x mass x velocity
C. Ek = 1/2 x mass x velocity squared
D. W = F x d

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

does anyone know or what?

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form