Work Energy and...

Velocity-time graph of a particle of mass $$2\,\,kg$$ moving in a straight line as shown in figure. Work done by all the forces on the particle is :

A force $$F=Kx^{2}$$ acts on a particle at angle of $$60^{o}$$ with $$x-$$ axis. The work done in displacing the particle from $$x_{1}$$ to $$x_{2}$$ will be:

A body of mass $$6\,kg$$  is under a force which causes displacement in it given by $$S = \dfrac{{{t^2}}}{4}$$  metres where $$t$$ is time. The work done by the force in $$2$$ seconds is:-

A light particle moving horizontally with a speed of $$12\ m/s$$ strikes a very heavy block moving in the same direction at $$10\ m/s$$. The collision is one-dimensional and elastic. If the speed of the block does not change after the collision, the particle will

A body of mass 'M' collides against a wall with a velocity v and retraces its path with the same speed. the change in momentum is ............. (take initial direction of velocity as positive)

A spring with spring constant $$k$$ is extended from $$x=0$$ to $$x={x}_{1}$$. The work done will be

A body of mass $$5 kg$$ under a force which causes displacement in it given $$S=\dfrac{t^2}{4}$$ meter where $$'t'$$ is time. The work done by the force in $$4 seconds$$ is:

Five equal force of $$10$$N each applied at one point and all are lying in one plane. If the angles between them are equal, the resultant force will be

A body is moving along y-axis and force acting on it is given by F = sin Ky, where K is a constant . The work done by the force from y = 0 to y = 1 is 

When the mass of body is halved and velocity is doubled, then the kinetic energy of the body