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# physics aqa (sep sience...2hrs 15mins) watch

1. right all im confused just before the exam now...lol 2mo....anyway i have some random past paper q's on loads of physics some says on pressure q is pressure of air in the inflated bag....do we need to learn this?
also i know we need to know about moments however something about cars with centre of mass?i know what its on about...just never seen it in my life till today?and finally....i have a question...itl help you revise as well as me cause i cant remember how 2 do it...and my revision guide doesnt make sense anyway here goes :

the mass of a dancer is 50kg and the mass of her coach is 90kg as they move away from each other the speed of the dancer is 1.5m/s.calculate the speed of the coach (3 marks).....anyone explain plz?

rgrds
50 X 1.5 = 90x
75/90 = x

x = 0.83 (thats what i got but i dnt have the answer booklet so i cdnt chek it, it was a kinda guess but the answer seems kinda real)
3. (Original post by flipflop2)
50 X 1.5 = 90x
75/90 = x

x = 0.83 (thats what i got but i dnt have the answer booklet so i cdnt chek it, it was a kinda guess but the answer seems kinda real)
Yeah I got the same

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