Nine five-rupee coins are put on top of each other on a table. Each coin has mass in kg. The reaction of the 5th coin (counted from bottom) on 6th coin is:
Correct answer: C. 4 mg
- A. 0 mg
- B. 2 mg
- C. 4 mg
- D. 5 mg
Explanation
The 5th coin supports the four coins above it, so the normal reaction equals weight of 4 coins = 4 m g, where m is mass of one coin.
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