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how do i work out the drag?

results for 2m are 1.24s

i tried working out the actual average velocity and then the theoretical average velocity

i tried working out the actual veloity by using vectors and suvat

2cos15 = 1.93

2sin15 = 0.52

i worked out the vertical acceleration and also the horizontal acceleration

how do i work out the actual velocity and the theoretical velocity down the slope?