(A) : When a person is walking horizontally with a suitcase on his head, no work is done by him against gravitational force.(R ) : gravitational force on suitcase acts vertically downwards and motion is in horizontal direction, hence dot product becomes zero.

(A) : When a person is walking horizontally with a suitcase on his hea

1.	(A) : When a person is walking horizontally with a suitcase on his head, no work is done by him against gravitational force.(R ) : gravitational force on suitcase acts vertically downwards and motion is in horizontal direction, hence dot product becomes zero.
Answer» Both (A) and (R ) are true and (R ) is the correct explanation of (A) Both (A) and (R ) are true and (R ) is not the correct explanation of (A) (A) is true but (R ) is FALSE (A) is false and (R ) is false ANSWER :A