A block is placed on a horizontal plank. The plank is performing $SHM$ along a vertical line with amplitude of $40\,cm.$ The block just loses contact with the plank when the plank is momentarily at rest. Then :
  • Athe period of its oscillations is $2\pi /5 \,sec.$
  • B
    the block weights on the plank double its weight, when the plank is at one of the positions of momentary rest.
  • Cthe block weights $1.5$ times its weight on the plank halfway down from the mean position.
  • D
    all of the above
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