The height meters of a mass projected vertically upwards at a time seconds s=ut-0.5gt². Determine how long the mass will take

The height meters of a mass projected vertically upwards at a time seconds s=ut-0.5gt².

Determine how long the mass will take after being projected to reach a height of 16m on the ascent. b. on the descent when u=30m/s and g=9.8m/s​

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