Answer:
The distance traveled by the skier is 5.309 km
Solution:
As per the question:
Mass of the skier, m = 64 kg
Coefficient of friction between the ski and the snow, 
Mass of snow, M = 5.0 kg
Now,
To calculate the distance, 's' traveled by the skier, in order to melt 5.0 kg of snow:
We know that:

where
= coefficient of friction
N = Normal Reaction
N = mg
Thus
(1)
Also,
(2)
where
= Latent Heat of fusion
Thus from eqn (1) and (2):


s = 5.309 km
C. Seismic energy
This is energy that is released in earthquakes.
Impulse = change in momentum
The answer is 0.
I feel like it expresses time, but if there is another answer and they say otherwise, then they are probably right.
Hope this helps!
Answer:
500000000
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