The position of a baseball (in ft) is represented by r(t) = 55/2ti + (4 + 55/2t- 16t2)j. Find the arc length of the %3D trajectory (flight) of the baseball. (Let t = 0 represent when the ball is hit, Let j = 0 be ground level. Round your answer to one decimal place.) %3D Find the unit tangent vector to the curve at the specified value of the parameter. r(t) = 2 cos(t)i + 2 sin(t)j, t=

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