Work Energy and...

A ball tied to a string is swung in a vertical circle. Which of the following remains constant?

The K.E. of a body can be increased maximum by doubling its:

A lighter body moving with a velocity $$v$$ collides with a heavier body at rest. Then :

A certain force acting on a body of mass 2kg increase its velocity from 6m/s to 15 m/s in 2s. The work done by the force during this interval is ?

Name the type of energy (kinetic energy $$K$$ or potential energy $$U$$) possessed in a compressed spring:

Energy equals of a mass of one microgram in kilo joules is

A particle moves under the effect of a force $$F=Cx$$ form $$x=0$$ to $$x=x_{1}$$. The work done in the process is-

A stone tied to a string is rotated in a vertical circle. The minimum speed with which the stone has to be rotated in order to complete the circle :

Complete the following sentence:
The kinetic energy of a body is the energy by virtue of its______ .

A simple pendulum, composed of a bob of mass $$m$$ connected to the end of a massless rod, executes simple harmonic motion as it swings through small angles of oscillation.The maximum angular displacement with the vertical is denoted by $${ \theta  }_{ max }$$. Frictional effects and variation of acceleration due to gravity are negligible.  
Find out the correct statement?