The motion of an object along a straight line is modelled by the equation v = -t(t-5) where v m/s is the velocity and time is t seconds. What is the acceleration at t = 3?

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter2: Motion In One Dimension
Section: Chapter Questions
Problem 26P: A particle moves along the x axis. Its position is given by the equation x = 2 + 3t 4t2, with x in...
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The motion of an object along a straight line is modelled by the equation v = -t(t-5) where v m/s is the velocity and time is t seconds. What is the acceleration at t = 3? 

Please use calculus-based method in kinematics to solve this problem. Thanks!

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