i. False
Angular momentum can not change, because force acting on the satellite (gravitational force) is oriented along the radius-vector that connects satellite and the center of orbit. Force torque is 0, and so, it can not change angular momentum of satellite
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ii. True
This is true, because force, acting on particle, is central force - it acts along the vector that connects the alpha particle and nucleus and this vector is in plane of motion. Hence, there will be no z-component of acceleration and of motion.
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iii. True
When satellite comes closer to Earth, its potential energy decreases. Because of energy conservation law, the kinetic energy increases on the same amount, and thus, it has greater speed.
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