Aprojectile is launched upward with a velocity of 160 feet per second from the top of a 75-foot stage. what is the maximum height attained by the projectile?

The volume of the marbles is 26-20.9 = 5.1 l and there ar e85 marbles

5.1/85 = .06 l/marble

then 200 marbles would requrie .06 l/marble x 200 marbles = 12 liters

so he would only need 26-12= 14 liters of water to fill the tank !

1L = 1000 cm^3

So 85 marbles occupy 2600cm^3 - 2090cm^3 = 510 cm^2

Volume of each marble = 510 cm^3 / 85 = 6 cm^3

Soamount of water required if 200 marbles are used = 2600 - 200(85) = 1400cm^3 = 14 L