hey can you please help with this assignment I need these two questions and please show work and include units

11. DETAILS Show-Work Question 3. You may use your Calculator in this question. If a rock is thrown upward on the planet Mars with a velocity of 11 m/s, its height (in meters) after t seconds is given by H = 11t - 1.86t. (a) Find the velocity of the rock after one second. m/s (b) Find the velocity of the rock when t = a. m/s (c) When will the rock hit the surface? (Round your answer to one decimal place.) t = S (d) With what velocity will the rock hit the surface? m/s Submit Answer View Previous Question | Question 11 of 17 View Next Question Home My Assignments +Request Extension O JUN 24 ... MacBook Pro12. DETAILS Three students see this derivative: di = e4t - t-5 dt Each student guesses what the original function f is: . Bob writes f(t) = 4e4t + 51-6 . Chris writes f(t) = Left + + 17. . Dani writes f(t) = Left + t-4 Which of the three students wrote a correct antiderivative? Select all that apply. O Bob Chris O Dani Submit Answer View Previous Question Question 12 of 17 View Next Question Home My Assignments + Request Extension JUN 24 . . . MacBook Pro