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NEET 2009
Exam
NEET
Year
2009
Subject
Physics
Chapter
Laws of Motion

NEET 2009 · Physics · Laws of Motion

The mass of lift is 2000 ~kg . When the tension in the supporting...

The mass of lift is 2000 kg2000 \mathrm{~kg}. When the tension in the supporting cable is 28000 N28000 \mathrm{~N}, then its acceleration is :

Options

  1. A14 ms−214 \mathrm{~ms}^{-2} upwards
  2. B30 ms−230 \mathrm{~ms}^{-2} downwards
  3. C4 ms−24 \mathrm{~ms}^{-2} upwards
  4. D4 ms−24 \mathrm{~ms}^{-2} downwards

Correct answer

C. 4 ms−24 \mathrm{~ms}^{-2} upwards

Step-by-step solution

ΣF=ma⇒T−mg=maa=T−mgm=4 m/s2\begin{aligned}& \Sigma F=m a \\ & \Rightarrow \mathrm{T}-\mathrm{mg}=\mathrm{ma}\\ & \mathrm{a}=\frac{\mathrm{T}-\mathrm{mg}}{\mathrm{m}}=4 \mathrm{~m}/ \mathrm{s}^2 \end{aligned}
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