posted by Deepa .
A rock is tossed straight up with a velocity of 37.1 m/s. When it returns, it falls into a hole 18.8 m deep.
How long is the rock in the air, from the instant it is released until it hits the bottom of the hole?
hfinal=hinitial+vi*time -1/2 9.8 time^2
hfinal is -18.8 hinital is zero.
solve for time, notice it is a quadratic.