Answer :

Let the height to which the block will rise be h.

Mass of the block, m = 5 kg

Upward speed of the block, v = 2 m/s

The potential energy of the spring gets converted into kinetic energy of the block

mgh = 1/2 mv2

h = 0.2 m

The block will rise up to 0.2 m or 20cm

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