A ball is thrown vertically upwards with a velocity of $$\SI[per-mode=symbol]{2}{\meter\per\second}.$$ It is seen at height $$h$$ twice.

Find the sum of the times, measured in seconds from the moment the ball is thrown, at which it is seen at height $$h$$.


Details and Assumptions:

• Take $$g=\SI[per-mode=symbol]{10}{\meter\per\second\squared}$$.
• Neglect air resistance.
×