Questions in Work, Energy and Power

Select	Question
	A spring with spring constant k is extended from $x = 0$to$x = {x_1}$. The work done will be
	If a long spring is stretched by 0.02 m, its potential energy is U. If the spring is stretched by 0.1 m, then its potential energy will be
	Natural length of a spring is 60 cm, and its spring constant is 4000 N/m. A mass of 20 kg is hung from it. The extension produced in the spring is, (Take $g = 9.8\;m/{s^2}$)
	The spring extends by x on loading, then energy stored by the spring is : (if T is the tension in spring and k is spring constant)
	The potential energy of a body is given by, U =$A - B{x^2}$(Where x is the displacement). The magnitude of force acting on the particle is
	The potential energy between two atoms in a molecule is given by $U(x) = \frac{a}{{{x^{12}}}} - \frac{b}{{{x^6}}}$; where a and b are positive constants and x is the distance between the atoms. The atom is in stable equilibrium when
	Which one of the following is not a conservative force
	Two bodies of masses ${m_1}$ and ${m_2}$ have equal kinetic energies. If ${p_1}$ and ${p_2}$ are their respective momentum, then ratio ${p_1}:{p_2}$ is equal to
	Work done in raising a box depends on
	A light and a heavy body have equal momenta. Which one has greater K.E