Anet force of 2.0 n acts on a 2.0-kg object for 10 seconds. what is the object’s kinetic energy after that 10 seconds (assuming the object starts from rest and there is no friction)?

For Newton's second law, the force F applied to the object of mass m will cause an acceleration a of the body:

So, the acceleration is 


The object undergoes through this acceleration for 10 seconds, t=10 s. Since it is an accelerated motion, we can find its final velocity after 10 seconds:

where  is the initial velocity of the object, which is zero since it starts from rest.

Finally we can calculate the final kinetic energy of the object, which is given by

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