A ball is thrown straight up from the roof of an 80-foot building and it's height is modeled by the h(t) = −12t2 + 48t + 80, where h is the height in feet and t is time in seconds. How long (in sec) will it take the ball to hit the roof of the building on its way down? That is, solve h(t) = 80.

Assuming weightless pulleys and 100% efficiency, what is the minimum input force required to lift a 120 n weight using a single fixed pulley?

Select the correct answer from each drop-down menu. compared to its surroundings, the concentration of solutes is low inside a cell. so, the cell is with respect to its surroundings. a particular solute in this cell uses energy for its transport from the cell to its surroundings. this type of transport is called

The softest and hardest minerals are: softest hardest