may I please get some help with D and E (explained).

SIVEIT DY d(t) = 30t - 3t2. a. Use the limit definition of the derivative to find the velocity v(t) and acceleration a(t) functions (two separate calculations). b. How are the graphs of d(t) and v(t) related and how do they relate to the motion of the ball? For example, explain what both the ball's height and speed are doing while y = v(t) is above the r-axis. c. What are the ball's height and speed doing when y = v(t) is below the r-axis? d. What is the ball's speed when y = v(t) passes through the r-axis, and what can you say about the ball's height at this time? e. What is the ball's max height, and at what time does it reach max height? Explain