ch02-p056 - 56. (a) We neglect air resistance, which...

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() ( ) 2 2 0 1 43.9 m 1.99 s 9.8 m/s 1.99 s 2 v −= which leads to v 0 = 12.3 m/s. (b) The velocity of the stones are given by 0 ( ) , ( 1) yy dy vg t v v g t dt dt ΔΔ == = = The plot is shown below: 56. (a) We neglect air resistance, which justifies setting a = – g = –9.8 m/s 2 (taking down as the – y direction) for the duration of the motion. We are allowed to use Eq. 2-15 (with Δ y replacing Δ x ) because this is constant acceleration motion. We use primed variables (except t ) with the first stone, which has zero initial velocity, and unprimed variables with
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