A box of mass m1=5.60 kg rests on a second box of mass m2=13.0 kg. Both are on the floor of an elevator that goes up with constant acceleration of magnitude a=4.90 m/s2, as illustrated in the figure. Assume that the magnitude of gravitational acceleration is g=10.0 m/s2. What is the magnitude of the contact force between the two boxes?

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One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.