Kinetic energy is defined as ½ mv2, where m is the mass of the object, and v is the velocity (or speed). Two gas molecules have the same kinetic energy, but molecule X has four times the mass of molecule Y. What can you say about their speeds?

The velocity of molecule Y is 2 times the velocity of molecule X

Explanation:

Data provided in the question:

Formula for kinetic energy =  ½ mv²

Let the mass of molecule X be 'm₁' and velocity 'v₁'

and mass of mass of molecule Y be 'm₂' and velocity 'v₂'

Thus,

According to the question

m₁ = 4m₂      (1)

since the kinetic energy of both the molecules are equal

Therefore,

½ m₁v₁² = ½ m₂v₂²

or

m₁v₁² = m₂v₂²

from (1)

4m₂v₁² = m₂v₂²

or

4v₁² = v₂²

or

2v₁ = v₂

hence,

The velocity of molecule Y is 2 times the velocity of molecule X

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

read more on -

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force