A block of mass m is suspended from a spring and executes verticle SHM of time period T as shown in figure. The amplitude of the SHM is A and spring is never in compressed state during the oscillation. The minimum force exerted by spring on the block is

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The spring is never com pressed Hence spring shall exert teast force on the block when the block is at topmost position F net ​ = kx 0 ​ − kA mg = m ω 2 A = mg − 4 T 2 π 2 ​ mA

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