A70 kg person does a bungee jump from a bridge. the natural length of the bungee cord is 20m and it has a spring constant k of 80 n/m. when the bungee cord has a total length of 25m, what is the acceleration of the jumper (to 2 significant figures)? hint: draw a fbd showing the magnitudes and directions of all forces on the jumper at the instant described.

Explanation:

For this exercise we can use Newton's second law and ask us for the acceleration of the jumper

    F = ma

Let's set a reference system and take the positive direction up

    fe - W = m a

    k DX - mg = m a

we clear we calculate

     a = k / m ( -x₀) - g

     a = 80/70 (25 -20) - 9.8

     a = 11.43 -9.8

     a = 1.6 m / s²

Directed up

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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