a heavy rock with 100kg is placed on a scale in an elevator that is moving downw

Question

a heavy rock with 100kg is placed on a scale in an elevator that is moving downward with a constant speed 2m/s. suddenly, the cable that holds breaks and the elevator starts free fall. What is the reading on the scale after the cable break? A. 980N B.100N C.0N D.490N a heavy rock with 100kg is placed on a scale in an elevator that is moving downward with a constant speed 2m/s. suddenly, the cable that holds breaks and the elevator starts free fall. What is the reading on the scale after the cable break? A. 980N B.100N C.0N D.490N A. 980N B.100N C.0N D.490N

Explanation / Answer

In a free fall,the object will travel down with a=9.8 m/s^2 =g so net normal force on the scale will be

F=mg-ma=mg-mg=0

s0 F=0N

option(C) is correct

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