Posted by **Mike** on Tuesday, September 21, 2010 at 10:42pm.

The position of a particle moving in a straight line during a 2-second trip is given below.

s(t) = 2t 2 - 6t + 7 cm

(a) What is the average velocity for the entire trip? (Assume the 2 second interval starts at t = 0.)

1 cm/second

(b) Find a time at which the instantaneous velocity is equal to this average velocity.

2 seconds

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