[填空题]
A tennis ball bounces on the ground n times. The heskl +;t,me.sr b,d xq6ights of the bounces, 9tjakjcf-5(-8 qqhzn*isy a zr)xrr32/.xa g$h_1,h_2,h_3,....,h_n$, form a geometric sequence. The height that the ball bounces the first time, $h_1$, is 80 cm, and the second time, $h_2$ , is 60 cm.
Find the value of the common ratio for the sequence.
r= .
Find the height that the ball bounces the tenth time, $ℎ_10$ .
$ℎ_10$= .
Find the total distance travelled by the ball during the first six bounces (up and down). Give your answer correct to 2 decimal places.
The number= cm