vdxdttt==−+30 80302...in SI units. Thus, the initial speed is vi= 3.0 m/s and the speed at t= 4 s is vf= 19 m/s. The change in kinetic energy for the object of mass m= 3.0 kg is therefore ()221528 J2fiKmvvΔ=− =which we round off to two figures and (using the work-kinetic energy theorem) conclude
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