a block of mass m is pushed up against a spring with spring constant k until the

Question

a block of mass m is pushed up against a spring with spring constant k until the spring has been compressed a distance x from equilibrium. what is the work done on the block by the spring. A. W=kx^2 B.W=-kx^2 C.W=0 D. None of these a block of mass m is pushed up against a spring with spring constant k until the spring has been compressed a distance x from equilibrium. what is the work done on the block by the spring. A. W=kx^2 B.W=-kx^2 C.W=0 D. None of these a block of mass m is pushed up against a spring with spring constant k until the spring has been compressed a distance x from equilibrium. what is the work done on the block by the spring. A. W=kx^2 B.W=-kx^2 C.W=0 D. None of these

Explanation / Answer

Answer) option D) none of these

Reason : in this scenario , the work done by the block on the spring = (1/2)*k*x^2 (after the compressing the spring)

Therefore, same amount of negative work is done on the block by the spring due to the absence of external forces( law of conservation of energy)

So , work done on the block by the spring = -(1/2)*k*x^2

Since , no option matches the above answer

Therefore, answer) option D)

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