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48_Physics ProblemsTechnical Physics

# 48_Physics ProblemsTechnical Physics - Chapter 2 P2.67 Let...

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Chapter 2 49 P2.67 Let the ball fall 1.50 m. It strikes at speed given by vv a x x xf xi f i 22 2 =+ ch : v xf 2 029 8 0 1 5 0 −− () .. ±ms ±m 2 v xf = 542 . m s and its stopping is described by a x x a a xf xi x f i x x 2 2 2 3 2 05 4 2 21 0 29 4 200 10 147 10 =− + = −× × di bg ej . . . ms m m 2 Its maximum acceleration will be larger than the average acceleration we estimate by imagining constant acceleration, but will still be of order of magnitude ~10 3 2 . *P2.68 (a) xx v t a t fix i x =+ + 1 2 2 . We assume the package starts from rest. =++ 145 0 0 1 2 980 2 m m s 2 . t t = = 4 5 544 m s 2 . . (b) v t a t i x = 1 2 00 1 2 9 80 5 18 131 2 2 s m 2 distance fallen == x f 131 m (c) speed + = + = a t
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