In shown situation elevator is moving upward with acceleration of $5 m / s^{2}$ . If $m_{A} = 20 kg, m_{B} = 30 kg, m_{C} = 50$ kg then choose the correct match.

Question

In shown situation elevator is moving upward with acceleration of 5 m / s 2 . If m A ​ = 20 kg , m B ​ = 30 kg , m C ​ = 50 kg then choose the correct match.

TestHub · Accepted Answer

(P) Net force on B F B ​ = m B ​ a = 30 × 5 = 150 N P→3 (Q) Normal between A and B N A B ​ = m A ​ g e ff ​ = 20 × 15 = 300 N Q→2 (R) Normal between B and C N BC ​ = ( m A ​ + m B ​ ) g e ff ​ = ( 20 + 30 ) × 15 = 50 × 15 = 750 N R→4 (S) Normal between C and elevator N CE ​ = ( 20 + 30 + 50 ) × 15 = 100 × 15 = 1500 N S→5 P→3, Q→2, R→4, S→5 Option C

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