I would rather be hit by the deflated ball because it wouldn't hurt as bad because it wouldn't have a lot of weight to hurt me in anyway
Acceleration x time = velocity
Since you're given acceleration and time, just plug the values into the equation.
3

x 1.1 s = ?
Solve that equation, and remember your velocity should be in m/s.
Kinetic energy = 1/2mv^2
=1/2(25)(1^2)
= 12.5J
A. Gallium
'cause he predicted it's physical properties before it's discovery! After that, it was proved that Mendeleev's periodic table was useful.
Hope this helps!