Given:
The mass of the water balloon is,

The spring constant is,

The spring pulls back the slingshot by,

To find:
the
approximate the maximum height that the water balloon can reach
Step-by-step explanation:
The potential energy of the spring converts into the kinetic energy of the balloon and helps it to reach a maximum height.
The potential energy of the spring is,

The potential energy of the balloon at the maximum height 'h' is,

We can write,

Hence, the water balloon can reach upto 3.8 m.