Question

What is the tension in the string attached the pictured mass, which is hanging from the ceiling of an elevator that is accelerating upward at $3.00m/s^2$?

• A. $68.6N$
  
• B. $89.6N$
  
• C. $21.0N$
  
• D. $47.6N$
  
• E. $7.00N$
  

Answer 1

Answer: (B)

$89.6N$

Given : $m=7kg$ $a=3.0$ $m/s^2$ $g=9.8m/s^2$

Let the tension in the string be $T$.

$\therefore$ $ma=T-mg$

OR $7\times 3=T-7\times 9.8$ $⟹T=89.6$ N