Someone throws a rubber ball vertically upward from the roof of a building 8.2 m in height. The ball rises, then falls. It just misses the edge of the roof, and strikes the ground.
If the ball is in the air for 6.2 s, what was its initial velocity? (Disregard air resistance...
a=-g=-10 m/s?)

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.

Write a polynomial function with the given zeros x= -1,0,2show your work