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A horizontal plank has a rectangular blo...

A horizontal plank has a rectangular block placed on it. The plank starts oscillating vertically and simple harmonically with an amplitude of `40 cm`. The block just loses contact with the plank when the latter is at momentary rest. Thin :

A

the period of oscillation is `((2pi)/(5))`

B

the block weights its true weight `0.5` times its weight on the plank halfway up

C

the block weight double weights `1.5` time its weight on the plank halfway down

D

The block weight on the plank when the letter moves fastest

Text Solution

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The correct Answer is:
A, B, C, D
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