A student is weighing an object using a spring balance. The weight and mass of the object are respectively $(g = 10 m / s^{2})$

25 N, 5 k g

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50 N, 5 k g

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25 N, 2.0 k g

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50 N, 2.5 k g

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Solution

The correct option is B $50 N, 5 k g$
A spring balance measures the weight of any object, i.e, $W = m g$ .
It works on Hooke's law according to which the force required to extend the spring is directly proportional to the distance the spring is extended from its rest position.
The force acting on the spring here is the gravitational force.
If $m = x k g$ , then $W = 10 x N$ .
Thus, option B stands true for $x = 5$ .

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