[填空题]
The graph below shows the variation with displacement of kinetic energy of a 0.20 kg object which is performing simple harmonic motion.
1.Use the graph to determine the total mechanical energy of the object.$E_k max$= mJ
2.On the graph, draw a dotted line that shows the variation with displacement of potential energy of the object.
3.Use conservation of energy to show that the speed of the object is approximately $1.2\,ms^{−1}$ when the displacement is $10\,cm$.v≈ $ms^{-1}$
