madisong57 madisong57
  • 03-03-2016
  • Physics
contestada

A 49 Newton rock is lifted 2 meters in 5 seconds.
How much work is done?
What power is used?

Respuesta :

olemakpadu
olemakpadu olemakpadu
  • 03-03-2016
Work done is potential energy = mgh

mg = weight of the stone = 49 N

h = 5 m

Work done = (mg)h = 49 * 5 =      245 Joules.

Power =  Work done / Time taken

          =    245 / 5 =  49 Watts.
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