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# quick M1 question Watch

1. For question 7iv, why is the value of T the smaller value of the quadratic? So, why is t 3 instead of 6??

CONFUSED.
2. (Original post by master y)
For question 7iv, why is the value of T the smaller value of the quadratic? So, why is t 3 instead of 6??

CONFUSED.
They only really collide once.

From the quadratic equation, it tells us they collide either at time 3 or 6.

If they collided when t=3, then they won't collide again.

So the time cannot be 6. Since they have already collided.

And the question says "P and Q collide first when t=T."

Hope this makes sense.
3. (Original post by kogaht)
They only really collide once.

From the quadratic equation, it tells us they collide either at time 3 or 6.

If they collided when t=3, then they won't collide again.

So the time cannot be 6. Since they have already collided.

And the question says "P and Q collide first when t=T."

Hope this makes sense.
oh gosh that does make sense! thanks!

Updated: May 29, 2012
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