- #1

- 7

- 0

## Homework Statement

The position of a mass that is oscillating on a spring is given by x(t) = (14.5cm)cos[(14.0s-1)t].

What is the speed of the mass when t = 0.820 s?

## Homework Equations

A= Amplitude

W= Angular frequency

x(t) = ACos(Wt)

v(t) = -WASin(Wt)

## The Attempt at a Solution

v(0.820) = (-14.0)(14.5)Sin[(14.0)(0.820)]

= (-203)Sin[11.48]

= -40.4 cm/s

This seems so easy and yet apparently I have the wrong answer... any insight? :/ Thanks in advance