Aball is thrown upward with an initial velocity of 48 ft/sec from a height 640ft. it's height h, in feet, after t seconds is given by h(t)= -16t^2 +48t+640. after how long will the ball reach the ground?
the ball will reach the ground in

explanation:

as the height from which the ruler was dropped increased, the speed of the ruler at ryan's hand increased.

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.