A particle moves in the x–y plane according to S⃗ = (2î + ĵ) cos(ωt). The motion is:
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Question

A particle moves in the x–y plane according to S⃗ = (2î + ĵ) cos(ωt). The motion is:

G1 Physics · Accepted Answer

S⃗=(2î+ĵ)cosωt is always parallel to the fixed vector (2î+ĵ), so the path is a straight line. Also S̈⃗=−ω²S⃗, so it is SHM and therefore periodic. Correct answers: A, C, D.