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?
  • AThe amplitude of the oscillation is $70\ cm$
  • BThe kinetic energy is maximum at $t = \frac {1}{2}\ T$ 
  • CThe restoring force on the mass increases between $t = 0$ and $t = \frac {1}{4}\ T$ 
  • DThe speed is maximum at  $t = \frac {1}{4}\ T$ 
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