Solve the problem.The position(in feet) of an object oscillating up and down at the end of a spring is given by  at time t (in seconds). The value of A is the amplitude of the motion, k is a measure of the stiffness of the spring, and m is the mass of the object. Find the object's velocity at time t.

A. v = A cos  ft/sec
B. v = A cos  ft/sec
C. v = A cos  ft/sec
D. v = - A cos  ft/sec


Answer: B

Mathematics

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