simple machine class 9 science

12:02

5:12

7:44

1:37

54:42

4:24

10:15

4:53

8:44

10:08

3:40

4:53

4:27

10:03

3:40

8:47

10:15

6:01

23:46

2:16

10:51

12:28

4:32

9:00

9:00

5:05

کوتاه

10:04

12:56

3:29

6:10

5:02

3:32

10:03

5:59

15:18

17:49

4:59

3:29

5:05