How much work must be done by a force on $50\$$kg$ body in order to accelerate it from rest to $20\ m/s$ in $10\$$s$ ?

Water is dragged from a well of hepth 30 m using bucket of weight 50kg with water If the weight of the rope is 0.4 kg per metre, the amount of work done is ;

The force constant of a wire is k and that of another wire is $2k$When both the wires are stretched through same distance, then the work done.

By applying a force $F=(3xy-5z) j +4zk$ a particle is moved along the path $y=x^2$ from point $(0,0,0)$ to the point $(2,4,0)$. The work done by the F ;on the particle is (all values are in SI& ;units)

The distance $(x)$ converted by a body of $2\ kg$ under the action of a force is related to time $t$ as $x=t^{2}/4$. What is the work done by the force in first $2$ seconds?