Figure shows two 45° wedges, the smaller wedge w has a horizontal top face. It can slide down the larger wedge W , which is on a horizontal table. All the surfaces are smooth. A mass m sits on the top face of the upper wedge. Describe qualitatively the motion of the system once it is released from rest.

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TestHub · Accepted Answer

The mass m rests on the horizontal top face of wedge w (smooth contact), so the force on m from w is purely vertical. Hence m accelerates straight down (moves ↓).

Wedge w is pressed against the 45° face of W; as it slips it slides down along that incline - down and sideways (w moves ↘).

By reaction, the large wedge W is pushed horizontally along the smooth table, so W also moves.

Correct option: (D).

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