Class Management 1 Help Iomework 2 Begin Date: 1/19/2018 1000 :00 PM-Due Date: 2

Question

Class Management 1 Help Iomework 2 Begin Date: 1/19/2018 1000 :00 PM-Due Date: 2/2/2018 900.00 PM End Date: 5/112018 11:59.00 PM 10%) Problem 10: A swimmer bounces almost straight up from a diving board and falls vertically feet first into a pool She starts with a speed of 4.8 m/s, and her takeoff point is 1.95 m above the pool's surface. 33% Part (a) For how long are her feet in the air, in seconds? Grade Summary Potential cotan asin0 acos0 atan0 acotan0sinh0 coshO tan cotanh0+ Submissions Attempts remainin (2% per attempt) detailed view 1 2 3 29 ° Degrees O Radians NO Submit I give up Hints: 2% deduction per hint Hints remaining 2 Feedback: deduction per feedback. 33% Part (b) what is the height above the board, in meters, of her highest point? 33% Part (c) what is her velocity, in meters per second, when her feet hit the water? Assume the vertical component of the velocity is positive upwards

Explanation / Answer

a) h = ut + at^2/2

-1.95 = 4.8t - 9.8t^2/2

4.9t^2 - 4.8t - 1.95 = 0

solving this t = 1.29 sec

b) H = v^2/2g = 4.8^2/2x9.8 = 1.176 m

c) v = u + at

v = 4.8 - 9.8 x 1.29 = -7.84 m/s

Please rate my answer, good luck...

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