(Answered) A motorboat starting from rest travels in a straight line

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A motorboat starting from rest travels in a straight line on a lake.

(a) If the boat achieves a speed of 7.0 m/s in 15 s, what is the boat's average acceleration? Magnitude?

(b) Then, in 4.5 more seconds, the boat's speed is 11 m/s. What is the boat's average acceleration for the total time? Magnitude?

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