A rock having mass m is dropped from a height h above the ground. Employ the conservation of energy to determine (in terms of m and h) the given.
i) Determine the kinetic energy of the rock merely before it strikes the ground.
ii) Determine the speed, V(f), of the rock just before it strikes the ground.
iii) Determine the height above the ground where the speed of the rock is half of V(f).
iv) Did you require knowing the mass, m, to obtain the answer in part (ii) and (iii)?