A box fell from a moving truck and quickly skidded to a stop. While the box was
ID: 1491073 • Letter: A
Question
A box fell from a moving truck and quickly skidded to a stop. While the box was moving it had kinetic energy, but when it stopped its kinetic energy was zero. Is this a violation of the law of conservation of energy?
a. no, because all the kinetic energy of the box was converted to other types of energy.
b. yes, because all the kinetic energy of the box was destroyed.
c. Maybe, depending on the amount of kinetic energy converted to other types of energy.
d. We need to know the work done on the box to stop it.
e. We need to know the value of kinetic energy before the box stopped.
Explanation / Answer
Correct option is (d)
from work energy thorem work done equal to change in kinetic energy
in this process there is change in kinetic energy
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