[填空题]
A bouncy ball is dropped from a wp.hln xl1q8 e.+vj 0m slu7+wheight of 2 metrekzi125z vlix2udx; t /s onto a concrete floor. After hitting the floor, the balvux kdz/x i1 2;t52lizl rebounds back up to 80 % of it's previous height, and this pattern continues on repeatedly, until coming to rest.
1.Show that the total distance travelled by the ball until coming to rest can be expressed by
2+4(0.8)+4(0.8)$^2$+4(0.8)$^3$+...
2.Find an expression for the total distance travelled by the ball, in terms of the number of bounces, n.
3.Find the total distance travelled by the ball.S= metres.
