The Expert TA Human- x Physics question IChegg x C Secure h /Take Tu alAssignmen

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The Expert TA Human- x Physics question IChegg x C Secure h /Take Tu alAssignment.aspx (6%) Problem 8: A ball is thrown from a rooftop with an initial downward velocity of magnitude vo 2.1 m/s. The rooftop is a distance above the ground. h 25 m. In this problem use a coordinate system in which upwards is positive. Assignment Status Click here for detailed view Dtheexpertta.com Problem Status Completed 33% Part (a) Find the vertical component of the velocity, vy, in meters per second, with which the ball hits the ground. 2 Completed Grade Summary 3 Completed Completed Potential 100% 5 Partial cos0 Submission 6 Partial cotano as in acos0 Attempts remaining: 2 CO per attempt atan0 acotan0 sinho tanh0 cotanh0 10 e Degrees Radians 12 13 Hints deduction per hint Hints remaining: 4 Feedback: deduction per feedback 14 15 A 33% Part b) If we wanted the ball's final speed to be exact 27.3m/s. from what height. hmen (in meters). would we need to throw it 16 with the same initial velocity? f the height is fixed at 25 m but we wanted the balls final speed to be 32.7 s, what would the vertical component of the initial velocity vry need to be. in meters per second II 2:57 PM /24/2017

Explanation / Answer

(A) vf^2 - vi^2 = 2 a d

vf^2 - 2.1^2 = 2(9.81)(25)

vf = 22.25 m/s downwards

hence vfy = - 22.25 m/s

(B) 27.3^2 - 2.1^2 = 2(9.81)(H)

H = 37.7 m

(C) 32.7^2 - V0^2 = 2 (9.81)(25)

Vo = 24.06 m/s

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