posted by ET .
on the moon, the acceleration due to gravity is 1.6m/sec^2
a. if a rock is dropped into a crevasse, how fast will it be going just before it hits bottom 30sec later?
b. how far below the point of release is the bottom of the crevasse?
c. if instead of being released from rest, the rock is thrown into a crevasse from the same point with a downward velocity of 4m/sec, when will it hit the bottom and how fast will it be going when it does?
h=1/2 a time^2
h=vinitial*time+1/2 a time^2
solve the last for time, use the quadratic equation.