- A particle of mass 0.9 kg is attached to one end of a light elastic string, of natural length 1.2 m and modulus of elasticity 29.4 N . The other end of the string is attached to a fixed point \(A\) on a ceiling.
The particle is held at \(A\) and then released from rest. The particle first comes to instantaneous rest at the point \(B\).
Find the distance \(A B\).
(5)