How much power is needed to move a 7 kg mass 14 m in 16 sec?

1 Answer
John C.
Jun 8, 2017

0.17W

Explanation:

Power = Energy / time

The mass possesses kinetic energy since it is moving.
#E_k = 0.5mv^2#

Velocity = Displacement / time

  1. Calculate the velocity.
  2. Calculate its kinetic energy.
  3. Calculate the power.

#v_f =14/ 16 = 0.875 ms^-1#

#E_k = 0.5*7*0.875^2 = 2.680 J#

Power #= 2.680 div 16 = 0.17 W#

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