103. We use SI units so m= 0.030 kg and d= 0.12 m. (a) Since there is no change in height (and we assume no changes in elastic potential energy), then ΔU= 0 and we have 23mech013.8 10 J.2EKmvΔ=Δ=−=−×wherev0= 500 m/s and the final speed is zero. (b) By Eq. 8-33 (with
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