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A boy standing on a weighing machine not...

A boy standing on a weighing machine notices his wight as 400 N. When he suddenly jumps upward the weight shown by the machine becomes 600 N. The acceleration with which the boy jumps up is : (Take `g=10m//s^(2)`)

A

`5 ms^(-2)`

B

`3.4ms^(-2)`

C

`6 ms^(-2)`

D

`9.8 ms^(-2)`

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The correct Answer is:
A
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