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EXERCISE
Suppose the velocity of a particle moving along the x-axis varies in time according to the expression v, = (6.8 + 2.1t + 8.3t2) where t is in seconds.
Hint
(a) Find the average acceleration (in m/s) in the time interval t = 5.2 s to t = 6.1 s. (Indicate the direction with the sign of your answer.)
|m/s²
(b) Determine the acceleration (in m/s) at t = 9.3 s. (Indicate the direction with the sign of your answer.)
m/s2

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