# Simple oscilation

jeunesse27

## Homework Statement

A body is suspended vertically from an ideal spring of spring constant 3.5 N/m. The spring is initially in its relaxed position. The body is then released and oscillates about its equilibrium position. The motion is described by the following equation.

y = (4.5 cm) sin [(0.62 rad/s)t]

What is the maximum kinetic energy of the body?
[answer in mj)

Kmax=.5kA^2

## The Attempt at a Solution

.5(3.5)(.045)^2=.003543 J but the answer must be in mj. So, 3.543x10^-9 BUT computer did not accept the answer as a correct one... Could anyone help me please?
Thanks!

## Answers and Replies

Homework Helper
1 mJ equal to how many Joules?

jeunesse27
.003543 joules = 3.54300 × 10-9 megajoules
so if my answer is correct, then it is the machine error that it's not being accepted. is my answer correct?
Thanks

Homework Helper
.003543 joules = 3.54300 × 10-9 megajoules
so if my answer is correct, then it is the machine error that it's not being accepted. is my answer correct?
Thanks
mJ is milli joule i.e. 10^-3 J. Mega Joule is MJ = 10^6 J