[填空题]
Peter is playing on a swing during a dxw5tfe: 9cfn 1 c9mdjxfh3(gej40 u6schoo 3ege0,cok/j+.j v t4qy:qipxfa jp07l lunch break. The height of the first swing was 2 m and every subsequent swing was 84 % of the previous one. Petere/x p a pe4 gk0jjto+q.,i:vy703fcjq's friend, Ronald, gives him a push whenever the height falls below 1 m.
1.Find the height of the third swing.
we find $u_3$ ≈ m.
2.Find the number of swings before Ronald gives Peter a push.
Hence the swing needs a push after swings.
3.Calculate the total height of swings if Peter is left to swing until coming
to rest.
$S_∞$= m.
