In the same set-up as above, what is the velocity of the rock when it hits the ground? Use conservation of energy rather than kinematics.
a) The velocity cannot be determined without more information.
b) The velocity is equal to the initial velocity of the rock.
c) The velocity is zero.
d) The velocity is sqrt(2gh), where g is the acceleration due to gravity and h is the height from which the rock is dropped.
