If block A is kept on block B and moves in the positive direction with respect to B, then in which direction will the frictional force on A by B act?

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Q. A block of mass

2 k g

is pushed normally against a rough vertical wall with a force of

40 N

, co-efficient of static friction being

0.5

. Another horizontal force of

15 N

is applied on the block in a direction parallel to the wall. (Will the block move? If yes, in which direction and with what minimum acceleration? If no, find the friction force exerted by the wall on the block.)

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