question_answer

A box whose mass is 5 kg lies on a spring balance inside a lift. The lift starts to ascend with an acceleration of\[2\text{ }m{{s}^{-2}}\]. The reading of the machine or balance is\[(g=10\,m{{s}^{-2}})\]:

A)  50 kg                                    

B)  zero                     

C)  49 kg                    

D)         60 kg

E)  45 kg