The position vector of an object is r(t) = ( +, cos( v2t))i + (+, sin(v2t))j + (22 -t)k. Calculate the time t it takes for the object to reach z = 0. Then, compute the distance L travelled by the object from time t = 8 until t = 19. What is its speed | v| at t = 8 seconds? t = 22 seconds L = meters | v (8) 1 = meters per second