Answer:
P = 3800 W
Explanation:
Power is equal to energy divide by time P = E/t
plug in 4560000 J for energy
convert 20 minutes to seconds
20 * 60 = 1200 seconds
plug in 1200 seconds for time
P = 4560000/1200
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It's B
the metal will melt
from solid to liquid
Given
mass (m) =45kg
velocity (v) =15m/s
momentum (p) =?
Form
p=mv
=45x 15
p=675kg.m/s
the momentum =675kg.m/s