Question

A spring stretches 4cm when a load of 15N is suspended from it

A) how much does spring stretches when a load of 50N is suspended from it

B)what load would stretch this spring by 10cm

Answer 1

The stretch is related to the mass as
   
And so,
  
So, for the given spring, the spring constant k is fixed. And so, for two different weights, the stretches will be
  

A)

So, for given
   
And so, the stretch should be
  
   

B)

So, for given
   
And so, the corresponding load should be