Class Management | Help Second Assignment 1D Begin Date: 9/2/2018 12:01:00 AM- D

Question

Class Management | Help Second Assignment 1D Begin Date: 9/2/2018 12:01:00 AM- Due Date: 9/17/2018 11:59:00 P M End Date: 10/1/2018 11:59:00 PM A rock takes 31 s to hit the ground when it is thrown straight up from the cliff with an initial velocity of Sa s (5%) Problem, 21: 50% Part (a) Calculate the height of the cliff in m. 23 8 Correct! 50% Part (b) How long would it take to reach the ground if it is thrown straight down with the same speed? Grade Summary Deductions Potential 100% Attempts remaining 199 0% per attempt) detailed view cotan0 asin acos0 atan) acotan0 sinho . Degrees Radians NO 0% SubmitHant I give up lliati: 0% deduction per hint. Hints remaiingL Feedback: 0% deduction per feedback

Explanation / Answer

b) H = vt - 0.5gt2
- 23.8 = -7.5*t - 0.5*9.8*t2
t= 1.57 sec
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