The two-dimensional motion of a particle, described by r =( i +2 j ) A t is a/an: A. parabolic path B. elliptical path C. periodic motion D. simple harmonic motion Choose the correct answer from the options given below:

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Correct answer: D. C and D only

r =( i +2 j ) A t x=A t y=2 A t y=2 x The path is straight line. The motion is SHM and periodic as d r d t =-( i +2 j ) A t d^2 r d t^2 =-( i +2 j ) ^2 A t a =- ^2 r

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