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Doss [256]
2 years ago
8

Plaease help me with thesse four 40 points

Physics
1 answer:
Zielflug [23.3K]2 years ago
3 0

Answer:

For the first one c is the answer

For the second one c is also the answer

For the third one is b

Explanation:

I took that

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A train travels 83 kilometers in 2 hours, and then 79 kilometers in 2 hours. What is its average speed?
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A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stopwatch measures the stone's trajec
olga2289 [7]

Answer:

The height of the cliff is 90.60 meters.

Explanation:

It is given that,

Initial horizontal speed of the stone, u = 10 m/s

Initial vertical speed of the stone, u' = 0 (as there is no motion in vertical direction)

The time taken by the stone from the top of the cliff to the bottom to be 4.3 s, t = 4.3 s

Let h is the height of the cliff. Using the second equation of motion in vertical direction to find it. It is given by :

h=u't+\dfrac{1}{2}gt^2

h=\dfrac{1}{2}gt^2

h=\dfrac{1}{2}\times 9.8\times (4.3)^2

h = 90.60 meters

So, the height of the cliff is 90.60 meters. Hence, this is the required solution.

5 0
2 years ago
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