ch02-p075 - 75. We choose down as the +y direction and use...

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75. We choose down as the + y direction and use the equations of Table 2-1 (replacing x with y ) with a = + g , v 0 = 0 and y 0 = 0. We use subscript 2 for the elevator reaching the ground and 1 for the halfway point. (a) Eq. 2-16, vv a y y 2 2 0 2 20 2 =+ bg , leads to () 2 22 2 2 9.8 m/s 120 m 48.5 m/s . vg y == = (b) The time at which it strikes the ground is (using Eq. 2-15)
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