Calculate the change in momentum of a 10kg object that has an initial speed of 15m/s and slows to 8 m/s. If
this change occurs over a time of 3s, what force caused the change?

-23.33N

Explanation:

Momentum f = m (v - u) / t

given mass m = 10kg

Final velocity v = 8m/s

Initial velocity u = 15m/s

Time t = 3 secs

Using the above formula

F = 10 ( 8 - 15) /3

= 10 x -7 /3

= -70/3

= -23.33N

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.