A mass on a spring vibrates in simple harmonic motion at a frequency of 4.0 Hz and an amplitude of 4.0 cm.If a timer is started when its displacement is a maximum (hence x = 4 cm when t = 0),what is the speed of the mass when t = 3 s?
A)zero
B)0.006 5 m/s
C)0.015 m/s
D)0.024 m/s

Question

Quizplus · Accepted Answer

The speed of the mass is zero when the displacement is at a maximum or minimum, which occurs at the endpoints of the motion. Since the timer starts when the displacement is maximum, the speed is zero at that instant.

A Mass on a Spring Vibrates in Simple Harmonic Motion