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Solved: A ball is dropped from rest from the top of a
Chapter 2, Problem 20DQ(choose chapter or problem)
A ball is dropped from rest from the top of a building of height h. At the same instant, a second ball is projected vertically upward from ground level, such that it has zero speed when it reaches the top of the building. When the two balls pass each other, which ball has the greater speed, or do they have the same speed? Explain. Where will the two balls be when they are alongside each other: at height h/2 above the ground, below this height, or above this height? Explain.
Questions & Answers
QUESTION:
A ball is dropped from rest from the top of a building of height h. At the same instant, a second ball is projected vertically upward from ground level, such that it has zero speed when it reaches the top of the building. When the two balls pass each other, which ball has the greater speed, or do they have the same speed? Explain. Where will the two balls be when they are alongside each other: at height h/2 above the ground, below this height, or above this height? Explain.
ANSWER:Solution 20DQ
Let us have a look at the following figure.
Let us assume that the two balls meet at a distance of from the top as shown in the figure above.
For the first ball, initial speed is zero. Let be the speed of the ball at the distance
.
So,