Physics-
General
Easy

Question

A block is placed on a horizontal plank. The plank is performing SHM along a vertical line with amplitude of 40cm. The block just loses contact with the plank when the plank is momentarily at rest. Then:

  1. the period of its oscillations is 2 pi divided by 5 sec.    
  2. the block weights on the plank double its weight, when the plank is at one of the positions of momentary rest.    
  3. the block weights 1.5 times its weight on the plank halfway down from the mean position.    
  4. the block weights its true weight on the plank, when velocity of the plank is maximum.    

The correct answer is: the period of its oscillations is 2 pi divided by 5 sec.

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