This being a perfect collision means no energy is lost during the collision. Because this question asks for speed and not velocity, the speed will be the same because the final energy is the same. The speed after the collision would therefore be 1.27 m/s.
Answer: Partial pressure of nitrogen and xenon are 288mmHg and 548 mmHg respectively.
Explanation:
The partial pressure of a gas is given by Raoult's law, which is:

where,
= partial pressure of substance A
= total pressure
= mole fraction of substance A
We are given:


Mole fraction of a substance is given by:

And,

Mole fraction of nitrogen is given as:

Molar mass of
= 28 g/mol
Molar mass of
= g/mol
Putting values in above equation, we get:


To calculate the mole fraction of xenon, we use the equation:



Thus partial pressure of nitrogen and xenon are 288mmHg and 548 mmHg respectively.
The answer is D. disorganized
Momentum of the wagon increases by (200 x 3)
= 600 newton-sec
= 600 kg-m/sec