A block of mass m is kept on a rough horizontal surface and is attached with a massless spring of force constant k . The minimum constant force applied on the other end of the spring to lift the block is

Question

A block of mass m is kept on a rough horizontal surface and is attached with a massless spring of force constant k . The minimum constant force applied on the other end of the spring to lift the block is, M g, Mg 2, 2 M g, M g ( 1 + k )

MARKS App · Accepted Answer

As W ext = Δ E = 1 2 Kx 2 ; F.x = 1 2 Kx 2 or F = K x 2 For lifting K x = M g or F = Mg 2

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