Math Help - Velocity problem

1. Velocity problem

A car goes up a hill and down the other side. The time it takes the car is 3.25 minutes (it starts at 0).
The V(t) = .5t^2 -1.5t mi/min

What was the minimum velocity in mph?

When did it reach the top of the hill?

How would I find these?.. I know how to work with them, I am just not sure on what I am looking for.

2. Originally Posted by Morgan82

What was the minimum velocity in mph?

find $v'(t) = 0$

3. Originally Posted by pickslides
find $v'(t) = 0$
When the acceleration = 0?

4. yep, although the answer requires a unit of mph, your question is in mpm.

Make sure you convert it.