The potential energy that the ball has at the top of the tower is its kinetic energy when it hits the ground. The second ball has more potential energy at the top, because you did more work on it to carry it up there. So it has more KE at the bottom. (A)
Friction I believe is the answer
hope this helps
Should be just 2 km. - 2 km would mean it is moving in the opposite direction which come to think of it may be fine. You really can't tell.
Answer:
The question has the following answer options:
A. It decreases.
B. It increases.
C. It decreases then increases.
D. It does not change.
The correct answer is: D. It does not change.
Explanation:
The trajectory of a projectile is the path that a body follows when it has been thrown. It can be depicted in a coordinate system. Typically, the horizontal x axis stands for the distance that the object travels (in direction x) and the vertical and axis stands for the height (in direction y) of the throw. This very common form of movement is surprisingly simple to analyze if the following two assumptions are made:
1. The acceleration of free fall, g, is constant throughout the range of motion and is directed downward.
2. The effect of air resistance can be ignored.
With these assumptions, it is found that the curve that describes a projectile, and that it is known as its trajectory, is always a parable.
The horizontal velocity remains constant because in that direction the acceleration is zero.
<span>The statement, a hard material
is easily scratched, is false, the answer is letter F. Harder materials have
strong bonding between their neighboring atoms and it takes a greater amount of
energy for them to break apart, even a scratch. The relative hardness of a
mineral can be tested by the Moh’s scale or the mineral hardness. The Moh’s
scale can be characterized by the ability of the mineral to resist scratch
resistance by scratching a harder or softer mineral. It has a scale of 1 to 10
where 1 being the softest and 10 being the hardest.</span>
