PH 125 Midterm: ph125_s14_exam1-SOLN (1)
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Exam i solutions: a stone is dropped into a river from a bridge 43. 9 m above the water. The stones strike the water at the same time. Solution: let to = 1 s be the delay between the rst stone dropping and the second stone being thrown, and h = 43. 9 m be the height both stones start from. We"ll call y the vertical axis, with +y being upward. The rst stone"s coordinate as a function of time is then. The rst stone hits the river when y1(t) = 0, or y1(t) = h gt2. 2 thit = s 2h g (1) (2) (3) This is how long the rst stone takes to fall. The second stone takes a time to less. The second stone"s coordinate as a function of time from the time it was thrown downward with initial velocity viy is.
