[填空题]
A 340-kg marble bouldernds:w /sl;xw urcf b.)b0h7e 1 rolls off the top of a clifjbz +pnp4tvkyz .1jn)bm o h 8a/*2b:if and falls a vertical height of 140 m before striking the ground. Estimat+y4bi kjth oz1j/bn2bp.)na8vm *z :pe the temperature rise of the rock if 50% of the heat generated remains in the rock.
