First slide

making equation on system

Question

A body of mass 4 kg is suspended by a spring balance from the roof of an elevator cage. When the cage is moving up with constant acceleration, reading of the balance is 48 N. When the cage is moving down with same acceleration, reading of the spring balance is $(g = 10 m / s^{2}) .$

Easy

A

28 N
B

36 N
C

32 N
D

34 N

Solution

(3)
$\begin{array}{l} m g + m a = R_{1} \\ \Rightarrow 4 \times 10 + 4 \times a = 48 \Rightarrow a = 2 m / s^{2} \\ A g a i n m g - m a = R_{2} \\ \Rightarrow R_{2} = (4 \times 10 - 4 \times 2) N = 32 N . \end{array}$

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