#$2)$ My squirrels, named Half$-$tail and Eddy, sit on the different tree branches. Half$-$tail dropped an acorn, starting from rest, from a height of $1\mathrm{.}8m$ to the ground. Eddy throws an acorn straight downward from a height of $3\mathrm{.}5m$ to the ground. Two acorns reach the ground at the same time. Air resistance is negligible. Set the downward direction as positive. The magnitude of the gravitational acceleration is $9\mathrm{.}8\frac{m}{s^2}.$

$($A$)$ What is the initial velocity of acorn, which was thrown by Eddy?

$($B$)$ What is the velocity of the acorn, which was thrown by Eddy, when it reaches the ground?

$($C$)$ What is the velocity of the acorn, which was dropped by Half$-$tail, when it reaches the ground?