[单选题]
05.02: A pebble is dropped from a high verticaln *kuxu*i- ii:p ,7wfx4e q znqm-w5m*cliff. The collision of the pebble with the ground below is seen 1.50 seconds after the pe- 5m4mnqzwe* qbble is dropped. With what speed did the pebble hit the ground? Ignore air resistance.
A. 10 m/s
B. 15 m/s
C. 48.6 m/s
D. 100.4 m/s
E. 343 m/s