- #1
data1217
- 13
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I got a problem with my notes in introduction to mechanics.
In the 1st picture, why the deceleration should be " a=-g-kv" instead of " a=-g+kv" ?
The air drag should be against the motion. the motion is downward, then the drag should be pointing upward. So I think it should be "positive" instead of "negative"
In the 1st picture, why the deceleration should be " a=-g-kv" instead of " a=-g+kv" ?
The air drag should be against the motion. the motion is downward, then the drag should be pointing upward. So I think it should be "positive" instead of "negative"