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23 Nov 2019

A ball is dropped from the roof of a building, 1.50s after that, asecond ball is thrown straight down with an initial speed of 25.0m/, and the two balls land at the same time.

1. How long did it take for the first ball to reach theground?
2. How high is the building?
3. What are the speeds of the two balls just before they hit theground?

If you can show me how to answer #1, I can continue to answer therest. I'm stuck at finding out the time if I don't know the totalheight.

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Collen Von
Collen VonLv2
9 Feb 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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A stone is dropped from the roof of a building: 2.00s after that, a second stone is thrown straight down with an initial speed of 25.0 m/s, and the stones land at the same time. (a) How long did it take the 1st stone to reach the ground? (b)How high is the building? (c) What are the speeds of the 2 stones just before they hit the ground?

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A ball is dropped from the roof of a building. It hits the groundand it is caught at its original height 4.6 s later. (Assume theball bounces and returns to the height from which it wasdropped.)
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Ball A is dropped from the top of a building of height H at thesame instant ball B is thrown vertically upward from the ground.First consider the situation where the balls are moving in oppositedirections when the collide. If the speed of ball A is m times thespeed of ball B when they collide, find the height at which theycollide in terms of H and m. Take x = 0 at the ground, positiveupward.

1.1 With two equations, describe the conditions at the collision(position and velocities of the balls).

1.2 Write the expressions for position and velocity of the balls asa function of time.

1.3 Solve the above equations to find the height at which the ballscollide. Your answer should be expressed as a fraction of theheight of the building H and it should depend on the speed ratiom.

1.4 Now suppose that m can be negative (i.e. balls A and B aremoving in the same direction when they collide). Use the formuladerived above to graph the height of the collision (again expressedas a fraction of the building height H) as a function of m for -5< m < 5. Are there values of m for which the answer isunphysical?

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