Which combination of initial horizontal velocity, (vh) and initial vertical velocity, (vv) results in the greatest horizontal range for a projectile over level ground? [neglect friction.] 1. 2. 3. 4?

If an object is projected with vertical speed given as

now the time of flight of the object that time in which it comes back on ground

now here we will have

now the range of projectile is given as

now here we know that

now the range is given as

now in order to have maximum range we can say

so we will have

so now we can say

so both speed must be same to have maximum horizontal range