21. [0.5/1 Points] DETAILS PREVIOUS ANSWERS SCALCET9 4.9.071. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A stone is dropped from the upper observation deck of a tower, 150 m above the ground. (Assume g = 9.8 m/s-.) (a) Find the distance (in meters) of the stone above ground at time t. s(t) = 150 - 4.972 (b) How long does it take the stone to reach the ground? (Round your answer to two decimal places.) 5.53283 (c) With what velocity does it strike the ground? (Round your answer to one decimal place.) -246.9 x m/s (d) If the stone is thrown downward with a velocity of 9 m/s, how long does it take to reach the ground? (Round your answer to two decimal places.) -246.9 : S Need Help? Read It Watch It20. [0/1 Points] DETAILS PREVIOUS ANSWERS SCALCET9 2.8.041. MY NOTES ASK YOUR TEACHE The graph of f is given. State the numbers at which f is not differentiable. (Enter your answers as a comma-separated list.) X = -4,0 Enhanced Feedback"- Please try_again.Remember, functions are not_differentiable at corners,_discontinuities, or_vertical_tangents, . . . Need Help? Read It