When a mass is suspended from the end of a spring, it lengthens. For the same mass, the lengthening varies according to the spring used. The spring A opposite measures 8 cm. It lengthens. 1 cm for each 100g mass that is suspended at its end. The spring B measures 5 cm and extends by 1 cm for each 75g mass that is suspended at its end. It is possible to suspend the same mass to these two springs so that they are of the same length, once extended. What is this mass?

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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.