Given:
The mass of your first friend's bumper boat is

The speed of your first friend's boat before collision towards the left is

The mass of your second friend's bumper boat is

The speed of your second friend's boat before collision towards the right is

The boats collided perfectly elastic.
Required:
(a) Speed of first friend's boat
Step-by-step explanation:
According to the conservation of momentum,

As the collision is perfectly elastic, the kinetic energy will also be conserved

On substituting the values, the speed of the first friend's boat will be

Final Answer: The speed of the first friend boat is -1.94 m/s after the collision.