A ball is released from certain height. It loses $50\%$ of its kinetic energy on striking the ground. It will attain a height again equal to
One fourth the initial height
Half the initial height
Three fourth initial height
None of these
Explain work energy theorem.
Which of the following graphs is correct between kinetic energy $ (E), $ potential energy $(U)$ and height $(h)$ from the ground of the particle
A ball of mass $m$ moves with speed $v$ and strikes a wall having infinite mass and it returns with same speed then the work done by the ball on the wall is
Which graph shows best the velocity-time graph for an object launched vertically into the air when air resistance is given by $| D | = bv?$ The dashed line shows the velocity graph if there were no air resistance.
A small bar starts sliding down on inclined plane forming an angle $\theta $ with the horizontal. The friction coefficient depends on the distance $x$ covered as $\mu = kx$ , where $k$ is a constant. Find the distance covered by the bar till it stops