A man climbs a ladder carrying a concrete block of mass 5kg. If the ladder makes an angle of 30° to the vertical, and is 3m long how much work the man does on the block

Work = Fs(COS​θ)

F = mg
s = h
Work = mgh(COSθ)
      = 5*9.8*3(COS 30)
  = 147*√3/2
 = 127.3J

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