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  When the ball is in midair (point B), what is the net force ... ...

  When the ball is in midair (point B), what is the net force on the ball?
(A) 1.96 N
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 04. Gravitation

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  When the ball is in midair (point B), what is the net force ... ... 
Posted: 07/19/2013 16:35
Why isn't it -?
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Posted: 07/22/2013 14:59
Hello, Force is a vector, so it can be positive or negative depending on how you draw the x or y axis. In this case, indeed you can say it's -2N, if the positive axis were pointing upward. Since we are not given the reference axes, we can choose ones that benefit us in calculating, so the explanation assumes the positive axis points downward.
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