An 89 kg man lowers himself to the ground from a h...

Answers ( 1 )

  1. enni salonen
    enni salonen
    mass of the man = 89 kg  
    height (s) = 6.2 m
    frictionless pulley to a mass of the sandbag = 73kg
    what speed does the man hit the ground if he started from rest=?
    we know that v = u+at
    u = 0
    t=?
    a = ?
    to find the acceleration we use theexpression
    a = ( m2-m1 /  m2+m1 ) g
        = ( 89-73/ 89+73) 9.8m/s2
        = 0.97 m/s2         
    also we know that s = ut +(1/2) a t2     
                          6.2m=   (1/2)  0.97 m/s2  t2  
                      t 2=   6.2 m /0.485  
                          t  = 3.5 s  
         now use v = u+at
                           = 0 + 0.97 m/s2 (3.5 s)
    simplfy the above you will get the answer

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