Motion in Two or Three Dimension : Projectile motion

1. The problem statement, all variables and given/known data

A projectile is launched at a 60° angle above the horizontal on level ground. The change in its velocity between launch and just before landing is found to be Δv = vlanding _ vlaunch = -20 y^ m/s .
What is the initial velocity of the Projectile ?
What is its final velocity just before landing ?
2. Relevant equations

Δv = vlanding _ vlaunch = -20 y^
m/s .
3.The attempt at a solution
I considered :
Vox + Vfx = 0 and Voy + Vfy = -20
knowing that V²fy – V²oy= -2g (Yf-Yo) But I couldn’t go further
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

http://ift.tt/1hU9Mzj

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