(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A speedboat moving at 31.0 m/s approaches a no-wake buoy marker 100 m ahead. The pilot slows the boat with a constant acceleration of -3.5 m/s2 by reducing the throttle.

(a) How long does it take the boat to reach the buoy?

______ s

(b) What is the velocity of the boat when it reaches the buoy?

______ m/s

2. Relevant equations

a = (v_{f}-v_{i})/t

v_{f}= v_{i}+ at

d = v_{i}t + (1/2)at^2

v_{f}^2 = v_{i}^2 + 2ad

3. The attempt at a solution

I keep getting an incorrect answer, but this is what I have been doing.

100 = 31t + (1/2)(-3.5)t^2

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# Homework Help: Speedboat Acceleration Question

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