Comprehension # 1 (Q. No. 19 to 21)
Figure shows a weighing machine kept in a lift. Lift is moving upwards with acceleration of \( 5 m / s ^{2} \). A block is kept on the weighing machine. Upper surface of block is attached with a spring balance. Reading shown by weighing machine and spring balance is \( 15 kg \) and 45 kg respectively.
Answer the following questions. Asume that the weighing machine can measure weight by having negligible deformation due to block, while the spring balance requires larger expansion: \( \left(\right. \) take \( \left.g=10 m / s ^{2}\right) \)
Mass of the object in \( kg \) and the normal force acting on the block due to weighing machine are:
(A) \( 60 kg , 450 N \)
(B) \( 40 kg , 150 N \)
(C) \( 80 kg , 400 N \)
(D) \( 10 kg \), zero
