Q. The mass of a lift is $2000\ kg$. When the tension in the supporting cable is $28000\ N$, then its acceleration is
A) $30\ ms^{- 2}$ downwards
B) $4\ ms^{- 2}$ upwards
C) $4\ ms^{- 2}$ downwards
D) $14\ ms^{- 2}$ upwards
Explanation
(b) $T = m(g + a) \Rightarrow 28000 = 2000(10 + a) \Rightarrow a = 4\ m/s^{2}$, upwards
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.