A force $\vec { F }=(3t\hat { i } +5\hat { j })$N acts on a body due to which its position varies as $\vec { S }=(2{t^2}\hat { i } -5\hat { j })$. Find the work done by this force in initial $2s$.

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 force on a particle as the function of displacement x(in x-direction) is given by $F=10+0.5x$

The work done corresponding to displacement of particle from $x=0$ to $x=2$ unit is?