ch07-p037 - 37. We choose to work this using Eq. 7-10 (the...

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v dx dt tt ==− + 30 80 30 2 .. . in SI units. Thus, the initial speed is v i = 3.0 m/s and the speed at t = 4 s is v f = 19 m/s. The change in kinetic energy for the object of mass m = 3.0 kg is therefore () 22 1 528 J 2 fi Km v v Δ= − = which we round off to two figures and (using the work-kinetic energy theorem) conclude
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