If it takes 6 sec for a ball to strike the ground when it it is released from rest, determine the height in meters of the building from which it was released. take (g - acceleration due to gravity to be 10 m/sec) 60 m 120 m 140 m 180 m

The height of the building is 180 meters.

Explanation:

It is given that,

Time taken for a ball to strike the ground, t = 6 sec

It is released from the rest. We need to find the height of the building from which it is released. It can be calculated using the equation as follows :

Here, a = g and u = 0

So,

s = 180 meters

So, the height of the building is 180 meters. Hence, this is the required solution.

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m