One billiard ball is shot east at 1.8 m/s . a second, identical billiard ball is shot west at 0.80 m/s . the balls have a glancing collision, not a head-on collision, deflecting the second ball by 90∘ and sending it north at 1.37 m/s .

Velocity of ball1 after the collision is 0.35 m/s at 53.87° due south of east.

Explanation:

By conservation of the linear momentum:

 Since both masses are the same, and expressing the equation for each axis x,y:

     eqX

                eqY

From eqX:  

From eqY:  

The module is:

The angle is:

  This is 53.87° due south of east

here are some information of the future of geothermal energy:

-the future of geothermal energy can pretty much be summed up with a single word: more

-scientists plan in going deeper than 120 meters

-we are hoping that one day, we will get all of our energy from renewable energy sources such as geothermal energy

hope this !

massxgravity x heght=weightxheight= pe

4900=490xh

h=10