An antiproton is the anti-particle of the proton. It has the same mass as a proton, but has a charge of -1.60 x
10-19 C and is made of antimatter. Whenever matter
and antimatter come into contact they will annihilate
and convert 100% of their mass into energy. If 285
protons collided with an equal number of antiprotons,
the total energy released would be x10-7 J.

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On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)