Answer:
11 kg
Explanation:
Let's start by the definition of kinetic energy, that is [tex]K = {1\over2} m v^2[/tex], let's replace what we have and solve for what's left.
[tex]550 = {1\over2}\cdot m \cdot 10^2[/tex]
[tex]m = {550\cdot 2 \over 100} = 11 kg[/tex]
