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Standard XIII

Physics

Work Done: Spring

A moving rail...

Question

A moving railway compartment has a spring of constant k fixed to its front wall. A boy stretches this spring by distance x and in the mean time the compartment moves by a distance s. The work done by boy w.r.t. earth is

$\frac{1}{2} k x^{2}$

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$\frac{1}{2} (k x) (s + x)$

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$\frac{1}{2} k x s$

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$\frac{1}{2} k x (s + x + s)$

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Solution

The correct option is A
$\frac{1}{2} k x^{2}$

Total work done is equal to the energy stored in the spring.

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A moving railway compartment has a spring of constant k fixed to its front wall. A boy stretches this spring by distance x and in the mean time the compartment moves by a distance s. The work done by boy w.r.t. earth is

The correct option is A 12kx2 Total work done is equal to the energy stored in the spring.

The correct option is A
$\frac{1}{2} k x^{2}$

Total work done is equal to the energy stored in the spring.