\f(c) What is the time required for one oscillation? |:| second(s) (Simplify your answer. Type an exact answer, using I: as needed. Use integers or fractions for any numbers in the expression.) (d) What is the frequency? |:| oscillations per second (Simplify your answer. Type an exact answer, using it as needed. Use integers or fractions for any numbers in the expression.) The displacement d (in meters) of an object at time t (in seconds) is given by the following equation. Answer parts (a) through (d). d = 9 sin (7t) (a) Describe the motion of the object. Is the motion simple harmonic? C} A. Yes, because the given equation is not in the form of d(t)= ae m (:3. B. Yes, because the given equation is in the form of d = a sin wt. {31' c. No, because the given equation is not in the form of d = a sin mt. (:22- D. No, because the given equation is in the form of d(t) = ae cos