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advanced higher maths help

I am completely stuck on this maths question please help.
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I'm on question 6, I've differentiated y to get 2t and x to get 1/t + 1. does ln go to 1 when differentiated? after that I must have done it wrong because my answer is far too simple.

Reply 1

ghostwalker

Original post by Bananasplitxxx

I am completely stuck on this maths question please help.

I'm on question 6, I've differentiated y to get 2t and x to get 1/t + 1. does ln go to 1 when differentiated? after that I must have done it wrong because my answer is far too simple.

Your dy/dt and dx/dt are correct - assuming that's 1/(t+1) for the latter.

So, just sub in t=1 to each and use Pythagoras to combine them to get the speed.