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## Homework Statement

A body performaning simple harmonic motion has a displacement x given by the equation x= 30 sin 50t, where t is the time in seconds. what is the frequency of the oscillation?

Answers are:

A. 0.020Hz B. 0.13Hz C. 8.0Hz D. 30Hz E. 50Hz

(correct answer is B according to the mark scheme)

## Homework Equations

ω = 2πf

x = Amplitude cos (2πf t)

x = Amplitude sin (2πf t)

x = Amplitude cos (ω t)

x = Amplitude cos (ω t)

## The Attempt at a Solution

f = 50/2π = 7.9577Ηz according to the standard SHM formulas, which means the answer is C not B? what has gone wrong?