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Question: Finding speed from position vector ERROR MESSAGE

Question:Finding speed from position vector ERROR MESSAGE

SophiaAraoz 15
vector homework
February 13 2018
1

eq := r(t) = 2*t^2*_i+16*_j+(10*t-12)*_k

 

I want the speed of the above position equation but I keep getting the error message "Error, invalid input: rhs received 2*t^2*_i+16*_j+(10*t-12)*_k, which is not valid for its 1st argument, expr"

 

I'm using Norm(rhs(eq));#Calculate Norm

 

I can't figure out what I'm doing wrong...

 
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