# Air Drag & No Drag on a Ball Projected Vertically

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1. Nov 13, 2014

< Moderator Note -- thread moved from General Physics to Homework Help forum >

If a ball is projected vertically upwards say with a velocity V.

Case 1: Without air drag
Case 2: With air drag

What will be the difference in v-t graphs and the motion of the ball
Air drag D=bv (b is a constant,v is velocity)

I know that in case 1, the velocity decreases as the ball goes up from V to 0.
$v=V-gt$
$(y=-mx+c)$
Hence it will be a straight line with slope -g.
With air drag will the graph still be a straight line??

Last edited by a moderator: Nov 13, 2014
2. Nov 13, 2014

### PeroK

What does the slope of the v-t graph represent? And when is this graph a straight line?

3. Nov 13, 2014

it is a straight line.. for consrant acceleration, vt graph is a straight line which is inclined... v=-gt+V is a straight line. pls dont say its parabolic.

4. Nov 13, 2014

### PeroK

And is there constant acceleration with air drag?

5. Nov 14, 2014

i got the answer...i was talking about no air drag case...with air drag, after serious integration, i found v(t) and it is a function with exponent and is in terms of terminal velocity...you can close the thread.