---
id: practical-python-1.5
source_exercise_id: "1.5"
title: "The Bouncing Ball"
section: "1.2 A First Program"
source_path: "01_Introduction/02_Hello_world.md"
source_repo: "https://github.com/dabeaz-course/practical-python"
source_commit: "93dca856b41c61a0a0f85ae334116e4c125629ea"
student_visible_solution: false
has_private_solution: true
skip: false
---

# Exercise 1.5: The Bouncing Ball

> Source: Practical Python Programming, `01_Introduction/02_Hello_world.md`.

### Exercise 1.5: The Bouncing Ball

A rubber ball is dropped from a height of 100 meters and each time it
hits the ground, it bounces back up to 3/5 the height it fell.  Write
a program `bounce.py` that prints a table showing the height of the
first 10 bounces.

Your program should make a table that looks something like this:

```code
1 60.0
2 36.0
3 21.599999999999998
4 12.959999999999999
5 7.775999999999999
6 4.6655999999999995
7 2.7993599999999996
8 1.6796159999999998
9 1.0077695999999998
10 0.6046617599999998
```

*Note: You can clean up the output a bit if you use the round() function. Try using it to round the output to 4 digits.*

```code
1 60.0
2 36.0
3 21.6
4 12.96
5 7.776
6 4.6656
7 2.7994
8 1.6796
9 1.0078
10 0.6047
```

## 关联来源

- [[summaries/02_Hello_world]]