Question

A worker drops a hammer from a second story roof that is 10 meters above the ground. If the hammer's height in meters above the ground is modeled by h(t)=-4.9t^2+10, where t represents time in seconds after the hammer is dropped, about how long will it take the hammer to reach the ground

Answer 1

set h =0 and solve for t

Answer 2

wait then isnt (t) 0?

Answer 3

when t = 0, h = 10
h(t) = 0

-4.9t^2 +10 = 0