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Question

A person of mass 60 kg is inside a lift of mass 940 kg and he presses the button on the control panel. The lift starts moving upwards with an acceleration of 1 m/s2. If g=10 m/s2, the tension in the supporting cable is


Your Answer
A
8600 N
Your Answer
B
9680 N
Correct Answer
C
11000 N
Your Answer
D
1200 N

Solution

The correct option is C 11000 N
We first draw the FBD of the given system 
and from the newtons equation F=ma   we get,

T(M+m)g=(M+m)a
T=(M+m)(g+a)=1000×11=11000 N
 

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