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ch02-p093 - 93 The object once it is dropped(v0 = 0 is in...

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93. The object, once it is dropped ( v 0 = 0) is in free-fall ( a = – g = –9.8 m/s 2 if we take down as the – y direction), and we use Eq. 2-15 repeatedly. (a) The (positive) distance D from the lower dot to the mark corresponding to a certain reaction time t is given by Δ y D gt = − = − 1 2 2 , or D = gt 2 /2. Thus, for 1 50.0 ms t = , D 1 3 2 9 8 50 0 10 2 0 0123 = × = . . . m / s s m = 1.23 cm. 2 c hc h (b) For t 2 = 100 ms,
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