Apear hangs in a tree at a height of 1.8 m. the pear has a mass of 0.2 kg. the pear falls out of the tree and lands on the ground. (use correct units in all answers.)

a. how much gravitational potential energy does the pear have before it falls?

b. how much kinetic energy does the pear have when it reaches the ground?

c. how fast is the pear moving when it hits the ground?

a) PE=mgh=0.2*9.8*1.2=2.352 J

b) KE=PE=2.352 J

c) m/s

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered

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.