No, the velocity of impact on the ground would not be the same for projectiles launched at different angles but with the same speed and from the same height.
When a projectile is launched at an angle, it can be broken down into two components of motion: horizontal and vertical. The horizontal component of motion remains constant throughout the trajectory since there are no horizontal forces acting on the projectile (assuming negligible air resistance). However, the vertical component of motion is affected by gravity, causing the projectile to follow a parabolic path.
The time of flight, range, and velocity of impact on the ground will depend on the angle at which the projectile is launched. For example, a projectile launched at a steeper angle will spend more time in the air and cover a shorter horizontal distance compared to a projectile launched at a shallower angle with the same initial speed and from the same height.
Therefore, while the initial speed and height remain the same, the angles of launch will result in different trajectories and, consequently, different velocities of impact on the ground.