Question

A mass of 0.1 kg executes SHM with amplitude 10
cm. Its kinetic energy at the mean position is 8 × 10-3 J. What is its equation of motion if the initial phase is 45°?

A x = 0.1 sin(4t + π/4)
B x = 0.1 cos(8t + π/4)
C x = 0.1 cos(4t – π/4)
D x = 0.1 sin(4t – π/4)
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