5. A position function is given by r(t) = (10m + 20 m s 2 t 2 )i 5 m s tj. What is the velocity of the object it describes at t=4.0s?

Using the same position function as the previous problem, what is the acceleration function?

Using the same position function again, make an accurate plot of position versus time for the first two seconds of flight.

What's the highest speed the object will reach in that time interval?