Assume the acceleration of the object is a(t) = −32 feet per second per second. (neglect air resistance.) with what initial velocity must an object be thrown upward (from ground level) to reach the top of a national monument (560 feet)? (round your answer to three decimal places.)

Explanation:

We are going to use the accelerated motion formula on the vertical component taking the upwards direction as positive.

Since at maximum height the speed will be , the formula can be written as , which for our values is:

Written to three decimal places.

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i just did this and got a 100.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.