An object of mass m is sliding with speed vi at some instant across a level tabletop, with which its coefficient of kinetic friction is µ. it then moves through a distance d and comes to rest. which of the following equations for the speed vi is reasonable?
a) vi = v2µd
b) vi = v2µmgd
c) vi = v-2µmgd
d) vi = v-2µgd
e) vi = v2µgd

Explanation:

Given

initial speed

coefficient of kinetic friction

It moves a distance d after that it comes to rest

acceleration offered by table top

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.