A4.00 kg box sits atop a 10.0 kg box on a horizontal table. the coefficient of kinetic friction between the two boxes and between the lower box and the table is 0.600, while the coefficient of static friction between these same surfaces is 0.800. a horizontal pull to the right (150 n) is exerted on the lower box, and the boxes move together. what is the magnitude and direction of the friction force on the upper box?

12000j is work done

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answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

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