Question

40. A block of mass m is hung vertically from an elastic
thread of force constant mg/a. Initially, the thread was
at its natural length and the block is allowed to fall
freely. The kinetic energy of the block when it passes
through the equilibrium position will be
(A) mga
(B) mga 2
(C) zero
(D) 2mgu​

Answer 1

Answer:

mga/2

.....................

Answer 2

Answer:

Mga/ 2

Explanation:

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