A block slides down a smooth incline. Which statement is correct?
AIts mechanical energy decreases because of friction
BIts potential energy increases while kinetic energy decreases
CIts potential energy converts into kinetic energy while total mechanical energy remains constant
DIts kinetic energy remains constant throughout the motion
Answer & Solution
Correct answer: C. Its potential energy converts into kinetic energy while total mechanical energy remains constant
A smooth incline implies friction is absent, so only conservative gravitational force does work. Therefore potential energy decreases, kinetic energy increases, and total mechanical energy remains constant.
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