(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Consider the following position function.

r(t)= et(cos(t)i+sin(t)j+7tk)

Find the speed of a particle with the given position function.

2. Relevant equations

I know I take the derivative of the function but I cant seem to get speed.

I got v=e^t(cos(t)i+sin(t)j+7(t)k)+ e^t(-sin(t)i+cos(t)j+7k)

3. The attempt at a solution

I just cant find the speed, i think i may be just slightly off. I currently have speed is 7e^t(t+1) which is wrong.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Speed of a Particle

**Physics Forums | Science Articles, Homework Help, Discussion**