9
Question
The graph below shows potential energy and kinetic energy plotted against time of a ball thrown straight up from the 10 storey building.
At what point on the graph does the potential energy of the object equal the kinetic energy of the object?
At what point on the graph does the potential energy of the object equal the kinetic energy of the object?
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Solution
The correct option is C C
When ball is thrown straight up from a 10 storey building, its height increases and velocity decreases i.e.potential energy increases and kinetic energy decreases ,then it starts coming down now as the height is decreasing so potential energy also decreases and velocity increases hence the kinetic energy.At some point in downward journey potential and kinetic energy become equal .At this position both graph lines will be at equal height from time axis therefore from graph we can see that its the point C at which both lines are at equal height.
When ball is thrown straight up from a 10 storey building, its height increases and velocity decreases i.e.potential energy increases and kinetic energy decreases ,then it starts coming down now as the height is decreasing so potential energy also decreases and velocity increases hence the kinetic energy.At some point in downward journey potential and kinetic energy become equal .At this position both graph lines will be at equal height from time axis therefore from graph we can see that its the point C at which both lines are at equal height.
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