A 0.3 kg stone is thrown horizontally at a speed of 20 m/s from a
40-m-tall building.
1. determine the X component of the stones momentum the moment after it is thrown .
2. determine the Y component of the stones momentum the moment after it is thrown.
3. what is the X component of the momentum just before lt hits the ground? 
4. what is the Y component of its momentum just before it hits the ground? .
5 what impulse did gravity impart to the stone?