Ball A is thrown in a horizontal x-direction from a certain height. Ball B is dropped at the same time and from the same height. Which of the following statements is true about Balls A and B? (Neglect Air Resistance}

Both balls hit the ground simultaneously

Explanation:

Let´s call b₁  ( the ball dropped ) the equation for a free fall movement is, tacking as the origin of coordinates  the level from which it was dropped

V = g*t  ( since V₀ initial velocity is 0 )

In the case of projectile movement the equation for Vx and Vy (these speeds are independent)

are:

Vx = V₀x      (constant)    and Vy = Voy + g*t  

Vy = V₀ * sin 0⁰ + g*t      Vy = 0 + g*t

As we can see V is the same in both cases then the balls hit the ground simultaneously

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask