Let total height = h and total time = t

now, h - 6.2 = 0.5 g * (t-0.2)² ........1

Using

h =ut -0.5gt^2 as

6.2 = u(0.2) - 0.5g *(0.04)...............2

This u is the same as v in :

v = g(t- 0.2).......3

Solve 3 and 1 to get the answer