[填空题]
A ski gondola is connqj f5+m7h)hc f. zng+jecte7:g)sjuqoj 8g d to the top of a hill by a steel cable of length 620 m and diameter 1.5 cm. As the gondola comes to the end of its run, it bumps into the terminal and sends a wave pulse along the cable. It is observed t) jqgu: gj78oshat it took 16 s for the pulse to return.
(a) What is the speed of the pulse? (Round to the nearest integer)$\approx$ m/s
(b) What is the tension in the cable? N