This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let T be the Tension in the string.

let the acceleration of the descending man be  a.  It is the weight of the person which gives acceleration to the person.  But tension opposes the weight.

           m g - T = m a
           T = m (g - a)  
           a =   g - T/m

   given the maximum tension T, so we get the minimum acceleration.  So the person must descend with more acceleration than this.

           a = g  - 50 * g / 98  = 4.8 m/sec²          if  g = 9.8 m/s²

1 5 1