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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 $t = \frac {1}{2}\ T$ 
• C
  The restoring force on the mass increases between $t = 0$ and $t = \frac {1}{4}\ T$ 
• ✓
  The speed is maximum at  $t = \frac {1}{4}\ T$