Question

(a) Calculate the height of a cliff if it takes 2.35 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.00 m/s. (b) How long a time would it take to reach the ground if it is thrown straight down with the same speed? 

          (a) Calculate the height of a cliff if it takes 2.35 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.00 m/s. (b) How long a time would it take to reach the ground if it is thrown straight down with the same speed?
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University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
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(a) Calculate the height of a cliff if it takes 2.35 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.00 m/s. (b) How long a time would it take to reach the ground if it is thrown straight down with the same speed?
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(a) Calculate the height of a cliff if it takes 2.35 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.00 m/s. (b) How long would it take to reach the ground if it is thrown straight down with the same speed?

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(a) Calculate the height of a cliff if it takes 2.35 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.00 m/s. (b) How long would it take to reach the ground if it is thrown straight down with the same speed?

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Transcript

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00:01 All right, so let's say there is a cliff and a ball is thrown vertically upwards with a speed of 8 meters a second, and the total time it takes for it to return down to the ground is 2 .35 seconds.
00:16 So we want to find the height of the cliff.
00:20 And so we'll call this delta h is going to be, you know, v times delta t minus 1�g, delta t squared.
00:31 And this should be equal to negative h, the height of our clothes, because the change in height is going downwards, right? so if we plug in the numbers 2 .35 squared times 4 .9, subtracted from 8 times 2 .35...
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