1. The problem statement, all variables and given/known data r(t) = ln ti + j, t > 0 find r′ (t) and r″(t) 2. Relevant equations none 3. The attempt at a solution r'(t)= 1/t i am I on the right track? The answer in the back is r'(t)= 1/t i -1/t^2 j Please help asap this is quite urgent! Thank you!