[填空题]
Peter is playing on a swi+dmi 7b cwym:ooy56 (wng during a school e r(0j8.4kecwk mhdj8lunch break. The height of the first swing 84e8 .jcj0e(hwkk mdr was 2 $\mathrm{~m}$ and every subsequent swing was 84 % of the previous one. Peter's friend, Ronald, gives him a push whenever the height falls below $1 \mathrm{~m}$ .
1. Find the height of the third swing.≈
2. Find the number of swings before Ronald gives Peter a push. n =
3. Calculate the total height of swings if Peter is left to swing until coming to rest.
