Question

A person of mass $60\text{kg}$ is inside a lift of mass $940\text{kg}$ and presses the button on control panel. The lift starts moving upwards with an acceleration $1.0{\text{m/s}}^2$. If $g=10{\text{ms}}^{-2}$, the tension in the supporting cable is :

• A. $8600\text{N}$
• B. $1200\text{N}$
• C. $11000\text{N}$
• D. $9680\text{N}$

Answer 1

The correct option is C $11000\text{N}$

For upward motion, the tension in the string is given as follows,

$T=m(g+a)=(940+60)(10+1)$

$\therefore T=11000\text{N}$

Hence, $\left(C\right)$ is the correct answer.