Answer:

Explanation:
From the exercise we have:

To find the velocity after 2.4s we need to use the following formula:


The negative sign means that the kit is going down.
Answer:
The gravitational acceleration is same for all objects.
a = b = c = d
Explanation:
Acceleration due to gravity or gravitational acceleration is the force exerted by Earth on unit mass of an object.
Acceleration due to gravity doesn't depend on the height of the object when the height is object is near to the surface of the Earth. Only when the height is comparable to the radius of the Earth, the value of gravitational acceleration changes.
But for the objects here, the gravitational acceleration is independent of the mass or height of the objects and has a constant value of 9.8 m/s².
Therefore, the gravitational acceleration of all the objects is same.
If 'a', 'b', 'c', and 'd' represent gravitational accelerations of objects 'a', 'b', 'c', and 'd' respectively, then a = b = c = d.
To solve this problem it is necessary to apply the concept related to root mean square velocity, which can be expressed as

Where,
T = Temperature
R = Gas ideal constant
n = Number of moles in grams.
Our values are given as

The temperature is

Therefore the root mean square velocity would be


The fraction of velocity then can be calculated between the escape velocity and the root mean square velocity



Therefore the fraction of the scape velocity on the earth for molecula hydrogen is 0.1736
Most of the light is absorbed.