Fossil fuels are made of decayed plants and animals by being exposed to extreme heat or pressure from the crust of earth!! Hope this helps
Answer:
(a)
(b) It is moving at 14 m/s.
Explanation:
(a)
Given:
The energy, , of an object moving with a velocity is given as:
, where, is its mass.
Multiplying both sides by 2, we get
Now, divide both sides by
Taking square root both sides, we get
Therefore, in terms of and is given as:
(b)
Using the above formula,
Plug in 4900 joules for and 50 kg for . Solve for . This gives,
Therefore, it is moving with a speed of 14 m/s.
Every body continues in a state of rest or uniform motion in a straight line unless acted on by a resultant external force. That's approximately Newton's first law of motion.
So, the velocity of something tends to remain the same, unless an external force changes it. This is sometimes called "inertia". A body at rest, as in with "no velocity" will tend to remain at rest, unless there's a force on it. inertia again.
Gravity!! It also keeps the planets in orbit!