Contact force or string tension between bodies pulled together on a smooth surface

This type of question, asked 3 times: 3 May 2023 S1, 18 Apr 2026 S1, 20 Apr 2026 S2. All 3 questions below, oldest first.

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Question 1
3 May 2023 S1
46 $Two blocks of masses 6 kg and 4 kg are placed in contact on a smooth surface. If a force of 5 N is applied on the heavier block, the force on the lighter block is$
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Question 2
18 Apr 2026 S1
104 $A block of mass M is lying on a horizontal frictionless surface. One end of the uniform rope of half the mass of the block is fixed to the block which is pulled in the horizontal direction by applying a force F at the other end. The tension in the middle of the rope will be$
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Question 3
20 Apr 2026 S2
106 $F$
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Question 1