A spring hangs vertically from the ceiling and a mass is attached to its free end. When the mass is pulled down and released, it oscillates vertically with simple harmonic motion of period T. The variation with time t of its distance from the ceiling is as shown. Which statement gives a correct deduction from this graph?
| A. |
The amplitude of the oscillation is 70 cm |
| B. |
The kinetic energy is maximum at `t=1/2T.` |
| C. |
The restoring force on the mass increases between t=0 and `t=1/4T` |
| D. |
The speed is maximum at `t=1/4T.` |
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