[填空题]
A ski gondola is conn nxb7ks.3y p9rected to the top of a hill by a st wnvlrk7*1o6d7y m1q) i 1pilcjwm(;seel 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. I1 )nm717yw1isq mrwlidjvc*p lk o6;(t 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