Answer:
300W
Explanation:
from my years in middle school, i have learned the equation is energy =power*time is 300W
I say that because it's the most likely thing that l wil pick
I think speed is the answer
Answer:
C:Hardness
Explanation:
if youre hitting something your going to see wich one breaks first
The brightness of the lamp is proportional to the current flowing through the lamp: the larger the current, the brighter the lamp.
The current flowing through the lamp is given by Ohm's law:

where
V is the potential difference across the lamp, which is equal to the emf of the battery, and R is the resistance of the lamp.
The problem says that the battery is replaced with one with lower emf. Looking at the formula, this means that V decreases: if we want to keep the same brightness, we need to keep I constant, therefore we need to decrease R, the resistance of the lamp.