You drop a rock from the top of a building of height h. your co-experimenter throws a rock from the same spot with a vertically downward speed vo, a time t after you released your rock. the two rocks hit the ground at the same time. find the expression for the time t, in terms of vo, g, and h.

Explanation:

First person:

    the rock is dropped

after t1 seconds it hit the ground, y(t)=0

Second person:

    the rock has a initial downward speed  

after t2 seconds it hit the ground, y(t)=0

the time t when the second person throws the rock after the first person release the rock is:

t=t1-t2

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.

1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//