Chapter 2: Q1PE (page 82)
Find the following for path A in Figure 2.59:
(a) The distance travelled.
(b) The magnitude of the displacement from start to finish.
(c) The displacement from start to finish.

Short Answer
- 6 m
- 6
- +6 m
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Chapter 2: Q1PE (page 82)
Find the following for path A in Figure 2.59:
(a) The distance travelled.
(b) The magnitude of the displacement from start to finish.
(c) The displacement from start to finish.

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What is the acceleration of a rock thrown straight upward on the way up? At the top of its flight? On the way down?
A woodpecker’s brain is specially protected from large decelerations by tendon-like attachments inside the skull. While pecking on a tree, the woodpecker’s head comes to a stop from an initial velocity of 0.600 m/sin a distance of only 2.99 mm.
(a) Find the acceleration in m/s2 and in multiples of (g = 9.80 m/s2).
(b) Calculate the stopping time.
(c) The tendons cradling the brain stretch, making its stopping distance 4.50(greater than the head and, hence, less deceleration of the brain). What is the brain’s deceleration, expressed in multiples of g?
Construct the displacement graph for the subway shuttle train as shown in Figure 2.18(a). Your graph should show the position of the train, in kilometres, from t = 0 to 20 s You will need to use the information on acceleration and velocity given in the examples for this figure.
Bacteria move back and forth by using their flagella (structures that look like little tails). Speeds of up to 50 µm/s (50×10-6 m/s) have been observed. The total distance travelled by a bacterium is large for its size, while its displacement is small. Why is this?
An object that is thrown straight up falls back to Earth. This is one-dimensional motion.
(a) When is its velocity zero?
(b) Does its velocity change direction?
(c) Does the acceleration due to gravity have the same sign on the way up as on the way down?
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