Answer to Question #79888 in Classical Mechanics for Irfan sukeri

Question #79888
Need to know why do we take the negative angle from the y-axis(60degrees) instead of positive angle from x-axis(30degrees) . Example: tan(-60) = Velocity in Y-axis / Velocity in X-axis.
1
Expert's answer
2018-08-20T10:13:09-0400
When we use the formula
tan⁡α=v_y/v_x
we take the angle from x-axis.
When we need to know the from the y-axis we use the formula:
tan⁡θ=v_x/v_y
where θ=90°-α.

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