Kinetic energy as a function of time

[Prabs3257]

Homework Statement:

a particle of mass m is subjected to a force F=F°(cos(t)i+sin(t)j) if initially the particle was at rest the kinetic energy of the particle as a function of time is fgiven by

Relevant Equations:

a=dv/dt

I got acceleration by dividing force by m then replaced a by dv/dt and then integrated it to get velocity as a fxn of time and hence got kinetic energy but problem is my ans does not match with any option can someone please compare their ans

 

[PeroK]

Can you show us what you did?

 

[Prabs3257]

Can you show us what you did?

 

[PeroK]

What velocity do you get at $t=0$?

 

[Prabs3257]

What velocity do you get at $t=0$?

Ya i got my mistake and got the ans thanks