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The initial velocity of an object is $40$ $m/s$. The acceleration a of the object is given by the following expression:

                                                          $a=-0.1v$

where $v$ is the instantaneous velocity of the object. The velocity of the object after $3$ seconds will be _______
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Arjun asked Feb 19, 2017
A point mass is executing simple harmonic motion with an amplitude of $10$ $mm$ and frequency of $4$ $Hz$. The maximum acceleration ($m/s^2$) of the mass is _______