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-iii! 26% (a Fri 10:57 AM Q E Firefox File Edit View History Bookmarks Tools Windo Help o O e MasteringPhysics: Bonus x C chegg study l Guided sol... x 0 a 0 https Session masteringphysics.com /myct em view?assignmentProble c Ca Search Most Visited Signed in as Juwan Mahaney Help close Physics 2750 Spring 2016 (University Physics I) Bookmarks Help Sign Out Bonus Homework Short Answer Question 2.2 previous l 2 of 28 l next Bookmarks Bookmarks Unsorted Be Short Answer Question 2.2 myZou: P Sign In Bb Login Part A N Netflix A rock is thrown directly upward from the edge of the roof of a building that is 45 meters tall. The rock misses the building on its way down, and is observed to strike All-N the ground 4.00 seconds after being thrown. Take the acceleration due to gravity to have magnitude g.80 m/s2 and neglect any effects of air resistance. With what speed was the rock thrown? files posted 3 Print Sm Login Pocket m/S Subm My Answers Give U Continue Provide Feedback Grade 29Explanation / Answer
The vertical displacement of the rock is,
y = y0 + vy *t + (1/2)a*t^2
Substitute y0 = 45 , t = 4 and a = -9.8
Then
0 = 45 + vy * 4 + (1/2)(-9.8)*(4)^2
Solve for vy
vy = 8.35 m/s
Therefore, the required velocity is 8.35 m/s
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