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.
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Expert's answer
2018-08-20T10:13:09-0400
When we use the formula tanα=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: tanθ=v_x/v_y where θ=90°-α.
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