What is the main difference between cardio and strength-training activities?

a.
cardio activities increase your physical strength, while strength-training activities work your heart and lungs.
b.
cardio activities work your heart and lungs, while strength-training activities strengthen your muscles.
c.
cardio activities require short bursts of energy, while strength-training activities strengthen your body over long durations.
d.
cardio activities improve your joints' range of motion, while strength-training activities work your heart and lungs.
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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.)