When a person stands on a weighing balance, working on the principle of Hooke’s law, it shows a reading of 60 kg after a long time and the spring gets compressed by 2.5 cm. If the person jumps on the balance from a height of 10 cm, the maximum reading of the balance will be

When a person stands on a weighing balance, working on the principle of Hooke's law, it shows a reading of 60 kg after a long time and the spring gets compressed by 2.5 cm.

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A person normally weighing 50 kg stands on a massless platform which oscillates up and down harmonically at a frequency of 2.0s−1 and an amplitude 5.0 cm. A weighing machine on the platform gives the persons weight against time. (a) Will there be any change in weight of the body, during the oscillation? (b) If answer to part (a) is yes, what will be the maximum and minimum reading in the machine and at which position?

A 20 N metal block is suspended by a spring balance. A beaker containing some water is placed on a weighing machine which reads 40 N. The spring balance is now lowered so that the blocks gets immersed in the water. The spring balance now reads 16 N. The reading of the weighing machine will be