A rock is thrown off a 30 m cliff at a 45° angle above the horizontal. Which is the following is true regarding the
acceleration of the rock?
(A) The acceleration will be of magnitude g and have
both horizontal and vertical components.
(B) At the peak of the rock’s path, the magnitude of
acceleration will be half of what it was when the
rock was initially thrown.
(C) The acceleration will be of magnitude g and in a
downward direction.
(D) The acceleration will be downward during the
rock’s ascent and upward during the rock’s
descent.
(E) The acceleration will increase throughout the
rock’s flight.