Answer:
I think it is the last one.
Explanation:
I am not sure because i am stuck on this one, too.
Answer:
a). Single replacement.
Explanation:
Because one element replaces another element in a compound
True, the path of the ball, as observed from the train window, will be a horizontal straight line.
An object projected from a certain height has a parabolic path when observed from a fixed point.
However, if the reference point is moving at the same velocity as the object, the path of the object's motion appears to be a straight line.
When the ball is released from the window of the train, it will move at the same constant velocity as the train, and the path of the ball's motion observed from the train window will be a straight line.
Thus, we can conclude that the given statement is true. The path of the ball, as observed from the train window, will be a horizontal straight line.
Learn more about path of motion of objects here: brainly.com/question/82610
Use of lubricant
Use of ball bearers
Use of streamlined body
Use of graphite
