Application 5. Write the equation of the line that is tangent to /(x) = 2x* - x' + x-I whenx = 1. 12 6. A ball is thrown straight upward. The height of the ball above ground in metres can be described by the function k() - -4.9/ + 16 + 2, where r is the number of seconds after the ball has been released. At what rate is the height of the ball changing at r = 2 s? /2 7. The position of a particle moving in a straight line is given by s() = = 15 - 8 + 281, where s(?) represents the number of metres the particle is from a fixed point after / seconds. a. What is the velocity of the particle at ? = 1? b. What is the velocity of the particle at r = 9? c. At what time(s) is the particle not moving? /6