calculating acceleration with friction

7:44

10:02

12:51

7:11

8:36

9:23

13:17

9:39

7:14

7:37

24:49

8:27

38:23

9:50

2:47:19

22:57

30:59

19:22

11:58

17:17

14:56

10:33

6:53

11:51

8:47

3:50

7:35

5:09

1:55:15

2:03

7:01

6:10

5:59

11:04

3:29:44

10:32

22:20

23:47

9:06

7:24

9:27

33:46

19:59

19:11

9:57

11:45

4:18

3:38

11:24

5:23

5:15

18:48

21:02

43:42

19:23

13:59

24:47

3:28

8:33

3:35