C the object changes its direction of motion at point

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Unformatted text preview: zero , because the ball is caught at the initial height so displacement is zero . d 27 m + 21 m = = 2.7 cm/s . Δt (30 min)(60 s/min) 13. (a) s = (b) The displacement is Δx = (27 m)2 + (21 m)2 = 34.2 m. v = Δx = Δt 34.2 m (30 min)(60 s/min) = 1.9 cm/s . Δx , so Δt 14. (a) v = vAB = vCD = 4.5 s – 3.0 s = 1.3 m/s ; 1.0 m – 1.0 m 1.0 s – 0 = 0 ; 9.0 m – 7.0 m 7.0 m – 1.0 m vBC = 3.0 s – 1.0 s = 3.0 m/s ; vFG = 11.0 s – 9.0 s = 0 ; 7.0 m – 9.0 m vDE = 6.0 s – 4.5 s = −1.3 m/s ; vEF = 2.0 m – 7.0 m − 9.0 s – 6.0 s = 1.7 m/s ; 2.0 m –...
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