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kenzieraerae6771
28.11.2019 •
Physics
Astone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. a stopwatch measures the stone's trajectory time from the top of the cliff to the bottom to be 4.3 s. what is the height of the cliff if air resistance is negligibly small?
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Ответ:
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 = 90.60 meters
So, the height of the cliff is 90.60 meters. Hence, this is the required solution.
Ответ:
D
Explanation:
If a car is moving very fast in a straight road or a highway in such a way that it has reached its limits as soon as it is going that fast it can break it limit