[填空题]
A stone is thrown vertically uck h9jqvk9;u 8u9i0v6pm6 sw rb8f:i54j uuctpward with a speed of $36 \; m/s$ from the edge of a cliff 90.0 m high (a) How much later does it reach the bottom of the cliff? $s$ (b) What is its speed just before hitting? $m/s$ (c) What total distance did it travel? $m$
