Question

A bag of rice weighs 200 kg. To what height should it be raised, so that its potential energy may become 9800 J ?

(Take g = 9.8 m $s^{-2}$).

• A. 2.5 m
  
• B. 5 m
  
• C. 10 m
  
• D. 9.8 m
  

Answer 1

The correct option is B 5 m

If the raising height $h$, Potential energy will be $PE=mgh$

So, $h=\frac{PE}{mg}=\frac{9800}{200\times 9.8}=5m$ take as $g=9.8m/s^2$