A-LevelMathematicsMechanicsMay/June 2019Paper 5 Q48 Marks
A particle P of mass 0.5 kg is attached to one end of a light elastic string of natural length 0.8 m and modulus of elasticity 16 N. The other end of the string is attached to a fixed point O. The particle P is released from rest at the point 0.8 m vertically below O. When the extension of the string is x m, the downwards velocity of P is v m s⁻¹ and a force of magnitude 25x² N opposes the motion of P.
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