Question

A coin is dropped from a hot-air balloon that is 280 m above the ground and rising at 8.5 m/s upward. For this problem use a coordinate system in which up is positive.

Find the time before it hits the ground in seconds.

Answer 1

the height function is:
\[h(t) = -4.9t^2 + v_o t + 280\]
set h=0 and solve for t

im not sure if the initial velocity will be 0 or 8.5

need 2nd opinion

Answer 2

appreciate the help

Answer 3

@phi