I've got the first part: the velocity at equals which is .
Still working on the second part.
The acceleration of a bus is given by , where is a constant.
If the bus's velocity at time is , what is its velocity at time ?
If the bus's position at time is , what is its position at time ?
I tried doing , but that can't be right as is the acceleration of the bus. So I'm not sure how to proceed now.