How does a sample of water at 311 K compare to a sample of water at 295 K?

it's 310 K

Explanation:

If you assume that no heat is lost to the surroundings, then you can say that the heat lost by the hotter sample will be equal to the heat absorbed by the cooler sample.

Now, the equation that establishes a relationship between heat lost or gained and change in temperature looks like this

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.

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