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Finding Ek with force, mass, and time.

  • Thread starter rowkem
  • Start date
  • #1
51
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Homework Statement



A 10kg box at rest is being pushed on a frictionless surface by a force of 10N. The force is in the same direction as the motion of the box. 10 seconds later, how much kinetic energy will this box have?

Homework Equations



1. F=ma
2. Vf=Vi+at
3. Ek=0.5mv2

The Attempt at a Solution



I used formula 1 along with the F and mass to find the acceleration to be 1 m/s2. Then, I plugged that into formula 2, given an initial velocity of 0, acceleration of 1 m/s2, and a time of 10s. This gave me Vf at 10m/s. I used that in formula 3, with mass being 10kg. This gave me a final Ek of 500J.

Is this correct? 500J seems a little high but, I've no clue how else to do this. Thanks in advance.
 

Answers and Replies

  • #2
3
0
1J is the energy exerted by a force of 1N thaat moves an object by 1m. The force in this case is 10N and the distance is 50m(0.5at^2=100/2), so 500J seems fine.
 

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