One species of eucalyptus tree, Eucalyptus regnens, grows to heights similar to those attained

One species of eucalyptus tree, Eucalyptus regnens, grows to heights similar to those attained by California redwoods. Suppose a bird sitting on top of one specimen of eucalyptus tree drops a nut. If the speed of the falling nut at the moment it is50.0m above the ground is42.7 m/s, how tall is the tree? Do you need to know the mass of the nut to solve this problem? Disregard air resistance.
→the answer is (a.143m) but i need steps a. 143mb. 288mc. 174md. 210m