Minimum initial velocity of the projectile launched at what angle

[vneff]

Homework Statement

Assume there is a wall located 100m downrange (x=100) from the projectile launching position (x=0) that is 55m (y=55) high. What is the minimum initial velocity of the projectile launched at what angle necessary to clear the wall?

Homework Equations

h=(v^2sin^2α)/2g

The Attempt at a Solution

I can find the displacement but I'm confused as to how I am supposed to find both velocity and the projectile angle from this information.

 

[azizlwl]

Homework Statement

Assume there is a wall located 100m downrange (x=100) from the projectile launching position (x=0) that is 55m (y=55) high. What is the minimum initial velocity of the projectile launched at what angle necessary to clear the wall?

Homework Equations

h=(v^2sin^2α)/2g

The Attempt at a Solution

I can find the displacement but I'm confused as to how I am supposed to find both velocity and the projectile angle from this information.

2 unknowns, angle and velocity.
Then you have find 2 equations to solve the problem.

 

[CAF123]

Homework Statement

Assume there is a wall located 100m downrange (x=100) from the projectile launching position (x=0) that is 55m (y=55) high. What is the minimum initial velocity of the projectile launched at what angle necessary to clear the wall?

Homework Equations

h=(v^2sin^2α)/2g

The Attempt at a Solution

I can find the displacement but I'm confused as to how I am supposed to find both velocity and the projectile angle from this information.

Do exactly what azizlwl said. You have two unknowns, so you need two equations to get a solution. You could find one of those equations by considering energy and the other by using projectile kinematics.