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What is the difference between y=mx+c and (y-y1)=m(x-x1) as both represent equation of line in terms of a point(x,y).

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What is the minimum energy rquired to launch a satellite of mass m from the surface of the planet of mass M and radius R in a circular orbit of radius 2R Three brothers live in a farm. They agreed to buy new seeds: Adam and Ben would go and Charlie stayed to protect fields. Ben bought 75 sacks of wheat in the market whereas Adam bought 45 sacks. At home, they split the sacks equally. Charlie had paid 1400 dollars for the wheat. How much dollars did Ben and Adam get of the sum, considering equal split of the sacks?