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# on3 - Problem We read in the textbook that something slows...

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Solution for On-Line Homework 3 Acceleration I Solution to On-Line Homework Problem 3.1() Problem: Which is a projectile: A baseball in flight or a rocket in flight? Ignore air resistance. Select One of the Following: (a) A baseball and rocket are both launched, so nei- ther is a projectile. (b) A baseball and rocket both fly, so both are pro- jectiles. (c-Answer) A baseball is not powered after it is launched, so it is a projectile. (d) A rocket is powered after it is launched, so it is a projectile. (e) I’m just answering at random without reading. I will get the grade I deserve for picking this one. Solution Projectiles are not self-propelled, which disqualifies the rocket. The baseball in flight is a projectile, since it is in freefall throughout its flight (ignoring air resistance, that is). Total Points for Problem: 2 Points 1

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Solution to On-Line Homework Problem 3.2(Which was is the acceleration?)
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Unformatted text preview: Problem: We read in the textbook that something slows down when its velocity and acceleration are in opposite directions, and it speeds up when they are in the same direction. There is also an acceleration when direction changes. So, for an object you throw straight up, what directions must the acceleration be for the three parts of the motion, going up, at the top, and coming down? Select One of the Following: (a) up, zero, down (b) zero, zero, down (c) zero, zero, zero (d) zero, down, down (e-Answer) down, down, down Solution It slows down going up, so acceleration must be down. It turns around from up to down, so direction changes in the downward direction at the very top, evne though it isn’t moving, so down, and it speeds up on the way back down, so down!!! Total Points for Problem: 2 Points 2...
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