A student wants to learn about falling objects, so she drops a hammer, paper ball and marble from three different heights. She records the drop time and final speed for each trial as shown on the diagram and the mass (in grams) of each object is shown.

magnified images possible images can be real = projected onto a screen

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered

im sorry i dont know

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