Calculate the mass of an object that need 425N to accelerate at a rate of
2.1 m/s2 *

mass M = 202.4 kg

Explanation: Given that the

Force F = 425N

Accelerate a = 2.1 m/s2 

From the definition of force, which is the product of mass and acceleration. I.e

F = Ma

Make M the subject of the formula

M = F/a

M = 425/2.1

M = 202.38 kg

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )

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.