A) 49 N
B) 24 N
C) 74 N
D) 15 N
Correct Answer: B
Solution :
When the lift is stationary \[W=mg\] Þ \[49=m\times 9.8\] Þ \[m=5\,kg.\] When the lift is moving downward with an acceleration \[R=m\,(9.8-a)=5[9.8-5]=24N\]You need to login to perform this action.
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