What is the Displacement of a Particle from t=1s to t=3s?

[Jimmy84]

Homework Statement

Determine the displacement of this particle from t=1s to t=3s

r=-(5,0m/s)t i + (10,0m/s^2)t^2 j + (7,0m -(2,0m/s^3)t^3) k

Homework Equations

The Attempt at a Solution

I don't have an idea how to do this if I should to it by replacing t by 1 and then getting the magnitude of the vector for example. or should i get the value of t = 1 by each component alone and substract the components of 3 - the components of 1 ?

I must finish this soon thanks for the help in advance

 

[azureth]

the equation represents the position vector in the form of coordinates.make t=1and t=3,you will get two position vectors (-5,10,5)and(-15,90,-20).use the knowledge of vector of the form of coordinates and you will get the answer

 

[Jimmy84]

the equation represents the position vector in the form of coordinates.make t=1and t=3,you will get two position vectors (-5,10,5)and(-15,90,-20).use the knowledge of vector of the form of coordinates and you will get the answer

Now I must only get the magntitude of the vectors? thanks

 

[azureth]

you may get the magnitude of the vector of displacement by using pythagorean theorem

 

[Jimmy84]

you may get the magnitude of the vector of displacement by using pythagorean theorem

thanks a lot