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How to calculate the angles?

Is the answer for the projectile one B? And the density question D?

I get that but see resultant is something you would only get once the weight is balanced. Like that's the extra force which is making it accelerate. This is confusing. :/

http://maxpapers.com/wp-content/uploads/2012/11/9702_s13_qp_22.pdf Need help with question 2b. While taking acceleration why will we not add the weight and the resultant to calculate the total force and then calculate acceleration. The graph gives resultant only which means that the weight which...

\ Thanks a lot. I got them all. For the last question why can't I use the sine rule to find the unknown vector? I mean I tried that but I'm not getting the right answer.

I need help people?!

Need help.