Question
Hello!
A falling piano reaches a velocity of 120 km/h. Find the kinetic energy if the mass of the piano is 357 kg.
Ek= 1/2mv^2
Ek= 1/2(357)(33m/s)^2
Ek= 194386.5 J
The problem is that my answer key has the answer 208kJ. What's my error? I have tried this problem many times. And how do I know when to use Joules or Kilojoules? Thanks!
A falling piano reaches a velocity of 120 km/h. Find the kinetic energy if the mass of the piano is 357 kg.
Ek= 1/2mv^2
Ek= 1/2(357)(33m/s)^2
Ek= 194386.5 J
The problem is that my answer key has the answer 208kJ. What's my error? I have tried this problem many times. And how do I know when to use Joules or Kilojoules? Thanks!
Answers
bobpursley
Have you considered that the answer key is wrong?