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M2 Elasticity Question (help?)

Q: A light elastic string of natural length 50 cm is attached to a fixed point anв hangs vertically. A mass of 0.6 kg is attached to the other end thus producing an extension of 30 cm. Calculate the modulus of elasticity.
The string is pulled down a further 50 сm and released from rest. Calculate the initial acceleration produced and the height to which the mass will rise in subsequent motion.

A: so far I've found modulus to be 9.8N. stuck on the second part.

Would appreciate some help and guidance here.
I would help, but I am in bed!!!

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