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goblinko [34]
3 years ago
12

A man standing on top of a 30 m tall building throws a brick downwards with a velocity of 12 m/s. Determine the speed of the bri

ck just before it hits the ground.
Physics
1 answer:
loris [4]3 years ago
3 0

Answer:

27.1m/s

Explanation:

Given parameters:

Height of the building  = 30m

Initial velocity  = 12m/s

Unknown:

Final velocity  = ?

Solution:

We apply one of the kinematics equation to solve this problem:

         v²  = u²  + 2gh

v is the final velocity

u is the initial velocity

g is the acceleration due to gravity

h is the height

          v²   = 12²  + (2 x 9.8 x 30)

          v  = 27.1m/s

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the wavelength is 9.8 meters

Explanation:

We can use the relationship:

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Initially we have:

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then:

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now, if the velocity is doubled and the frequency remains the same, we have:

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A person must pull a rope 20 meters with a force of 200 N what is the work input?
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Work done = force * distance
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