When you stretch a spring 20 cm past its natural length, it exerts a force of 8 N. What is the spring constant of this spring? A. 1.5 N/cm
B. 0.4 N/cm
C. 25 N/cm
D. 160 N/cm

electromagnetic waves travel through space with vacuums. give me brainliest if right.

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.

the components of a vector are the parts of the vectors that are to each other.

b perpendicular