Hello Saksham, Greetings!

I hope that you'll be familiar with differentiation as this problem requires knowledge of the same. So, as we know:

F = Mass * Acceleration

Therefore, F = mass *  d^2x/dt^2  (As, differentiation of displacement gives velocity and differentiation of velocity gives acceleration).

Therefore, F = 2 * 6 = 12N

Now, Work = F * ds = 12 ( 3 * 5^2 - 2 * 5  + 5 - ( 0 - 0 + 5)) = 780 J.

Hope this answer helps you.

Feel free to ask any more queries that trouble you.