25:31

physics U3L1 Newton's first law

28:20

U2L3 Equations of motion

17:20

U2L2 Acceleration

20:00

Chemistry U2L3 Acids and bases

19:36

U2L4 free fall acceleration

23:20

Chemistry U1L3 metal an non-metal

13:47

Hardy's Integral

23:30

Chemistry U2L4 Classification of acids and bases