Problem 8 Bob is standing on the edge of a cliff with an unknown height. He drops a stone off of the cliff and observed

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Problem 8 Bob Is Standing On The Edge Of A Cliff With An Unknown Height He Drops A Stone Off Of The Cliff And Observed 1 (75.84 KiB) Viewed 25 times

Problem 8 Bob is standing on the edge of a cliff with an unknown height. He drops a stone off of the cliff and observed that it lands on the valley floor below 10.5 seconds later. (a) What is the height of the cliff, in units of meters? (b) How fast is the stone moving just before hitting the ground, in units of meters per second (m/s)? Problem 9 Some troublemaking kids are dropping water balloons from the roof of your apartment building. You are in your fifth-floor room and your window is 25 m above the sidewalk outside. You look outside and see that each balloon hits the pavement 1.5 s after passing your window. Express answers using 2 significant figures. (a) How fast are the balloons traveling when they pass your window? (b) Assuming the balloons are being released from rest, from what height above your window are they being released? (c) If you threw a balloon upwards from your window with an initial speed of 6.5 m/s, would you be able to get it to the roof? Problem 10 A particle moving in 1D has time-dependent velocity which is given by the quadratic function v(t) = At² + Bt+ C, where A = 4.5 m/s³, B = 3.6 m/s², and C= -1.7 m/s. (a) Find the average acceleration of the particle between t=0 s and 2.5 s. (b) Find the average acceleration of the particle between t = 2.5 s and 5.0 s. (c) At what time(s) is the particle at rest?