All following questions refer to a particle whose trajectory in time is given by

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All following questions refer to a particle whose trajectory in time is given by the vector function. ??(??) =< cos ??, sin ??, 2?? > 1. What is the velocity of the particle at time ?? = 0 ? 2. What is the speed of the particle at ?? = 0 ? 3. Is the speed of this particle constant? 4. Find the arc length function ??(??) of the helix ??(??) with ??(0) = 0 for ?? ? 0 and reparameterize the helix with respect to this arc length. 5. What is the acceleration vector of the particle at ?? = 0? 6. Find the unit tangent vector ?? and unit normal vector ?? at ?? = 0. 7. Find the tangential and normal components of the acceleration (???? and ????) at t=0

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cant understand, what is ?? in the post, please repost it

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