Time left 0:49:40 The work done by a net external force on a system is 36J...

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Time left 0:49:40 The work done by a net external force on a system is 36J and the work done by a frictional force acting on the system is -12.J. The change in the mechanical energy is Oa 12J O b. 24J OC 16J Od. 48J Time left 0:49:40 The work done by a net external force on a system is 36J and the work done by a frictional force acting on the system is -12.J. The change in the mechanical energy is Oa 12J O b. 24J OC 16J Od. 48J

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