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## Homework Statement

A 64kg student is standing in the middle of a frozen pond with a frictionless surface while carrying 2 books, a physics book with a mass of 2.5kg and a biology book with a mass of 3.5kg. The physics book is thrown with a speed of 6m/s relative to the student to the right and then the biology book is thrown in the opposite direction with a speed of 4m/s relative to the student. Calculate the velocity of the student after the biology textbook is thrown.

## Homework Equations

E = 1/2 mv(squared), initial moment = final momentum, therefore mv (initial) = mv (final), maybe more, I am not sure

## The Attempt at a Solution

Since the student is at rest, the initial momentum is obvisiously 0. But once the first book is thrown and then the second book, i don't know how to calculate the velocity of the student after each time a book is thrown.