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-) cl Secure I https//usp2rStreepettacnmCommervTakeTuiruuasimentas End Date: 1 Homework 3 (Ch 3: Motion in ID) Begin Date: 9 (6%) Pr blem 16. Asieel ball n dropped o no a hand flor fu aleg of2 75 and reb databetht of Lasma Use a coordimane system in which the vertical compoment of velocity is pouabve in the upwards deection Assigameot Status Click bare for detailed 50% Part (a) Calculnt its velony, in mren per second, jut before it strkn the floor Grade Semmary Problem Status 1 Completed 2 Completed 3 Complesed 4 Completed cota) cos) anacotn sinb) e Deprees Radbes 6 Compieted 7 Completed $ Completed Subeart Hst 9 Complered 10 Partisl ts avenge accelerstices in metets pes second squaed duing its coealect with the Roce if thon cornract lsta 0 050 Completed m (8.00 103) 12 Type here to seard

Explanation / Answer

consider the motion as the ball comes down

Vo = initial velocity at Top = 0 m/s

Vf = final velocity just before hitting the surface = ?

a = acceleration = - 9.8

Yo = initial position = 1.75 m

Y = final position = 0 m

using the equation

Vf2 = Vo2 + 2 a (Y - Yo)

Vf2 = 02 + 2 (- 9.8) (0 - 1.75)

Vf = 5.86 m/s

b)

Consider the motion while going up

Vo = initial velocity

Vf = final velocity at the top = 0 m/s

Y = displacement = 1.325 m

using the equation

Vf2 = Vo2 + 2 a Y

02 =  Vo2 + 2 (- 9.8) (1.325)

Vo = 5.1 m/s

t = 8 x 10-5 sec

Vo = initial velocity = - 5.86 m/s

Vf = final velocity = 5.1 m/s

using the equation

a = (Vf - Vo)/t = (5.1 - (- 5.86))/(8 x 10-5 ) = 1.37 x 105 m/s2

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