Assertion (A): The mechanical energy of earth-moon system remains same when a heavenly body passes nearby the earth-moon system.
Reason (R): Force exerted by heavenly body on the earth-moon system is non-conservative.
Solution:
Assertion (A) is false:
An external heavenly body exerts a gravitational force on the Earth-Moon system, causing its mechanical energy to change.
Reason (R) is false: Gravitational force is a conservative force by nature. Therefore, both Assertion (A) and Reason (R) are false.
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