Can normal force do a nonzero work on an object.

Yes

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I don't care

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None of these

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Solution

The correct option is B
Yes

Normal force is not always perpendicular to the direction of motion.

Example:

Work done by normal force on $M_{2}$ by $M_{1}$ will be positive.

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Can normal force do a nonzero work on an object.

The correct option is B Yes Normal force is not always perpendicular to the direction of motion. Example: Work done by normal force on M2 by M1 will be positive.

The correct option is B
Yes

Normal force is not always perpendicular to the direction of motion.

Example:

Work done by normal force on $M_{2}$ by $M_{1}$ will be positive.