[填空题]
A stone is thrown vertc5u unfdem5 6,ically upward with a speed of 12.0 m/s from the edgeb ;+z.8 tol2qxlqoit+ of a cliff 70.0 m high (Fig. 2–34).
i.bqzxt2 ot+8ll+qo; (a) How much later does it reach the bottom of the cliff? t = s
(b) What is its speed just before hitting? m/s
(c) What total distance did it travel? m