ractice Assignment 6 (CH 6) Begin Date: 3/12/2018 6:00:00 AM nd Date: 3/30/2018

Question

ractice Assignment 6 (CH 6) Begin Date: 3/12/2018 6:00:00 AM nd Date: 3/30/2018 2:00:00 AM Due Date: 3/29/2018 11:59:00 PM (9%) Problem 10: A ball of mass m = 1.55 kg is dropped from a height of 24 m into a basin of water. At a time of 1 = 1.44 s after striking the surface of the water, the ball's velocity has decreased by 50%. Otheexpertta.com What is the magnitude of the average force the ball experiences, in newtons, during the time ? Grade Summary Potential Submissions ave 100% sin0 cotan) atan) cosh) tan cotanh0 cosO asin tan() acoso Attempts remaining: 2 (0% per attempt) detailed view acotan) sinh ODegrees Radians I give up Hints:--deduction per hint. Hints remaining:- Feedback: 0% deduction per feedback.

Explanation / Answer

Ball's velocity when it was striking the water's surface is v = sqrt(2*g*h) = sqrt(2*9.8*2.4) = 6.86 m/s

after t seconds the final velocity of ball is 0.5*6.86 = 3.43 m/s

Average Force is Favg = m*a

Vo = 6.86 m/s

V = 3.43 m/s

t = 1.44 s

Using

V = Vo+(a*t)

3.43 = 6.86 + (a*1.44)

a = -2.38 m/s^2

then

using average Force is Favg = m*a =1.55*2.38 = 3.69 N

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