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 25.0m/s, and the two stones land at the same time. how long did it take the first stone to reach the ground? how high is the building? what are the speeds of the two stones just before they hit the ground?

Question

Chemistry

Ariella Andrews

7 April, 13:40

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 25.0m/s, and the two stones land at the same time. how long did it take the first stone to reach the ground? how high is the building? what are the speeds of the two stones just before they hit the ground?

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Answers (1)

Know the Answer?

Lia Sanchez · Answer 1

A) - 0.5 (9.8) * t^2 = - 25 (t-2) - 0.5 (9.8) (t-2) ^2

-4.9t^2 = - 25t + 50 - 4.9 (t^2-4t+4)

0 = - 25t+50+19.6t - 19.6

5.4t = 30.4

t = 5.62962963 s

b) h = - 4.9 (5.62962963) ^2

h = - 155.2943759

the building is 155.2943759 m high

c) speed 0of first stone

= at

= 9.8*5.62962963

= 55.17037037 m/s

speed of second stone

= v + at

= 25+9.8*3.62962963

= 60.57037037 m/s