Mosquito being charged by dinosaur

[chris097]

Homework Statement

A small mosquito is hovering in the air when a fast and massive dinosaur charges right into it with a speed of 2.62 m/s. If the collision is elastic what is the speed of the mosquito when it bounces off of the dinosaur.

Homework Equations

momentum equation

The Attempt at a Solution

Well since the don't specify the masses I just assume a tiny mass being hit by a massive one. The horizontal speed of the mosquito is 0 and the speed of the dinosaur is 2.62 m/s. I thought it would just be the same speed of the dinosaur (or slightlyyy larger) but this is wrong. Can someone please help?

Thank you very much

 

[redargon]

what equations did you use?