Part a b and c Part a b and c ssignment #2 Begin Date: 8/31/2018 12:01:00 AM Due

Question

Part a b and c Part a b and c ssignment #2 Begin Date: 8/31/2018 12:01:00 AM Due Date: 9/14/2018 11:59:00 PM End Date:9/14/2018 11:59:00 PM (33%) Problem 3: A ball is thrown from a rooftop with an initial downward velocity of magnitude Vo = 1.8 m/s. The rooftop is a distance above the ground, h-21 m. In this problem use a coordinate system in which upwards is positive. y. Otheexpertta.com S 33% Part (a) Find the vertical component of the velocity, vry, in meters per second, with which the ball hits the ground. 92% tan 7 8 9 sinO coanasin0 atan acotan sinh0 coshO tanhcotanh( cos0 (4% per attempt) detailed vi Degrees O Radians Hint I give up! Feedback: 5% deduction per feedback Hints: 4% deduction per hint. Hints same initial velocity? 33% Part (c) If the height is fixed at 21 m, but we wanted the ball's final speed to be 32.7 ms, what would the vertical component of the initial velocity Vry need to be, in meters per second?

Explanation / Answer

Given , vi = 1.8 m/s , a = - 9.8 m/s^2 ,h = - 21 m

a) Using , vf^2 - vi^2 = 2 a d

vf^2 - 1.8^2 = 2(-9.8)(-21)

vf^2 = 414.84

vf = 20.368 m/s

b) Now , vf= 27.3 m/s

So ,

27.3^2 - 1.8^2 = 2(-9.8)(-h)

h = 37.86 m

(c) 32.7^2 - (v')^2 = 2 (-9.8)(-21)

v' = 25.646 m/s

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