Chapter 6169(b)The time for which the box slides is given by∆xvvtagttagxixfkk=+−=−−LNMOQP=−FHGIKJ121202212dibgAAAµ.The car in the Earth frame acquires finals speed vvataxfxik=+−FHGIKJ02A. The speedof the box in the Earth frame is thenvvvagaagggvbebccekkkkkkkkk=+=−−+−FHGIKJ=−−+−=−=−=22222222AAAAAAafafaf.*P6.28Consider forces on the backpack as it slides in the Earth frame of reference.Fman mgma nm gafm gaFmamgamayykkxxkx∑∑−==+=−+=:,,:The motion across the floor is described by Lvt at vtgatxk=−+1212.We solve for k: vtLga tk+122, 22vt Ltk−+=af.P6.29In an inertial reference frame, the girl is accelerating horizontally inward atvr2257024013 5==...msm2In her own non-inertial frame, her head feels a horizontally outward fictitious force equal to its mass
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