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Q. A newly discovered planet has twice mass of the earth, but the acceleration because of gravity on the new planet's surface is exactly the same as the acceleration due to gravity on the earth's surface. What is the radius Rp of the new planet in terms of radius R of earth?

Q. A box of mass 29.9kg is subject to a horizontal applied force of 378N, and it accelerates to the right at 10.7 m/s2. What is the net x-direction force on the box?

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