physics
posted by Anonymous .
The tallest volcano in the solar system is the 18 km tall Martian volcano, Olympus Mons. An astronaut drops a ball off the rim of the crater and that the free fall acceleration of the ball remains constant throughout the ballâ€™s 18 km fall at a value of 4.4 m/s2. (We assume that the crater is as deep as the volcano is tall, which is not usually the case in nature.)
Find the time for the ball to reach the crater floor.
Answer in units of s

Kinematic Equation d = Vi*t + 1/2a*t^2
Vi = Initial Velocity
d = distance traveled
a = acceleration
t = time
Since Vi is 0(he drops it).
Also converted 18 km to 18000m
18000 = 0 + 1/2(4.4)*t^2
18000 = 2.2*t^2
(18000/2.2) = t*2
(18000/2.2)^1/2 = t
t = 90s