InterviewSolution
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InterviewSolution
| 1. |
(a) A student throws a ball vertically upward so tha it just reaches the height of window on th second floor of a dormitory. At the same time the ball is thrown upward, a student at the windoe drops a ball. Are the mechanical energies of the ball the same at half the height of the window ? Exaplain (b) What does work- energy theorem state ? |
| Answer» (a) Yes. When the thrown-up ball is at maximum height, its velocity is zero so it has same energy as the dropped ball. Since the total energy of each ball is conserved, both the balls will have same mechanical energy at half the height of the window. As a matter of fact, both the balls will have the same kinetic and potential energy at half height position. (b) Work done = change in KE (or PE) | |