Problem 18:  A particle of mass 0.61 kg begins at rest and is then subject to a force in the positive x direction that changes with time as given by the following function: F = mg[1-e-3.1t ], where g is the acceleration due to gravity.  Part (a)  Determine the change in the velocity Δv of the particle between t = 0 and t = 2.3 sec. Part (b)  Determine the change in x-coordinate of

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