A 1.5 kg object is moving at a speed of 8 m/s. What is the work done on the object if its velocity decreases to 4 m/s?
Options
A
-18 J
B
-24 J
C
-36 J
D
-48 J
Answer & Analysis
Answer
C
Analysis
To solve this problem, we can again use the
work-energy theorem, which states that the work done on an object is equal to
the change in its kinetic energy.
Calculate the initial kinetic energy
The initial velocity of the object is , and the mass is .
The initial kinetic energy
() is:
Calculate the final kinetic energy
The final velocity of the object is
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