C2 trig help

I drew the graph but I not sure what I should be looking for that indicates a change in direction...

I guess it's because the negative time indicates the opposite direction and we only have 2 solutions, one positive and one negative?

Yes if you just graph positive t. Alternatively you could integrate to find an expression for displacement and graph that.

No you sound a bit muddled. The change in direction occurs when the velocity moves from negative to positive.

I graphed +t and it's is just a steep line..

Oh blimey! You misunderstood me.

I want you to graph the quadratic $v=3t^2+3t-18$ where v is on the y axis and t is on the x axis and you only graph POSITIVE values on the horizontal t axis.

How many times does the velocity change sign? This is the indicator of a change in direction.

Do I just use any t values?

Solve:

Okay so I draw my quadrant diagram like this:



thanks

Oh blimey! You misunderstood me.

I want you to graph the quadratic $v=3t^2+3t-18$ where v is on the y axis and t is on the x axis and you only graph POSITIVE values on the horizontal t axis.

How many times does the velocity change sign? This is the indicator of a change in direction.

Hi Mr M

In the trig question I first posted about (from an exam paper) the question before it asked us to draw the graph of

Does this bare any significance to the next question? Have they included that question to help us with the next one?

Thanks

Yes that makes the next bit a little easier. You will see that there are two periods of the curve and that there are 4 solutions and their approximate values.