Your answer is going to be 0 degrees Kelvin!
Answer:
Option D
2 m/s East
Explanation:
From the law of conservation of momentum, the sum of initial momentum equals the sum of final momentum
Momentum, p=mv where m is the mass and v is the velocity
Since the masses are the same then
Therefore

where
and
are final velocities of objects while
and
are the initial velocities respectively
Taking East direction as positive then West as negative and by substitution

Therefore
hence East since it's positive
The answer is silver. Silver is the most dense, it's a solid so it is more compact and is obviously the most likely to have more mass to it.