If a box is lying in the compartment of an accelerating train and box is stationary relative to ...

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If a box is lying in the compartment of an accelerating train and box is stationary relative to the train. What force cause the acceleration of the box?
(a) Frictional force in the direction of train
(b) Frictional force in the opposite direction of train
(c) Force applied by air
(d) None of the above
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