Find the arclength parameterization of r= (15 sint,15 cost,8t) if t0 Suppose an object moves in space such that it position at time t hours is given by r(t) = (6t+1)i+t'j-ek. Find the velocity and acceleration vectors at time /= 2. If distances a measured in miles, what is the speed of the object at this time? (5 pts) Find and graph the domain of f(x,y)=x + 2-1 4