A stone is thrown vertically upward from a bridge, and its height h(t) (in metres) after t seconds is given by h(t)=−5t2+20t+2. Concerning the zeros of h(t), which statement is correct?
(a) It has two distinct real zeros, both of which are physically meaningful.
(b) It has two distinct real zeros, and only the larger positive zero is physically meaningful.
(c) It has exactly one real zero at about 2s when the stone momentarily stops.
(d) It has two distinct real zeros, and the positive zero is approximately 2s.