Question

A simple pendulum has a period of 4.50s when the length of the pendulum is shortened by 1.2m, the period is 2.50s. calculate the original length of the pendulum.
Original length of the pendulum = (4.50s/2.50s) x 1.2m = 2.4m
A body of mass 20g is made to perform simple harmonic motion at a frequency of 7Hz. Its speed when at a distance of 10cm from the mean position is 220cm/s. Calculate its 1) period ,2) angular speed,3) amplitude

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