[填空题]
A ski gondola is connected to th9:r*:4kl ur3 )so;ox quemky 4: vljyue tfk:kmx ;h+ra sl)pf 4+vnt6 f3op 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 terminalnkv)t+m fxfr4+3; k: ahfp6l s and sends a wave pulse along the cable. It is observed that 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