"Rocket Man" has a propulsion unit strapped to his back. He starts from rest on the ground, fires the unit, and accelerates straight upward. At a height of 16m, his speed is 5.0 m/s. His mass, including the propulsion unit, has the approximately constant mass of 136 kg. Find the work done by the propulsion unit. (PLEASE HELP!!)

Question

"Rocket Man" has a propulsion unit strapped to his back. He starts from rest on the ground, fires the unit, and accelerates straight upward. At a height of 16m, his speed is 5.0 m/s. His mass, including the propulsion unit, has the approximately constant mass of 136 kg. Find the work done by the propulsion unit.   (PLEASE HELP!!)

anonymous · Answer

Work= Change of Energy 
Work = Change of potential energy + kinetic energy
          = mgh  + 1/2mv^2
          = 136g*16+1/*136*25

anonymous · Answer

Thanks :D