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A bird flies east from one branch to another at 7.5 m/s for 2.4 s, pauses, then flies east at 6.8 m/s for 3.5 s to a further branch. What is its total displacement from the start?
A6 m east
B18 m east
C24 m east
D42 m east
Answer & Solution
Correct answer: D. 42 m east
1. Both legs are eastward, so their displacements add rather than cancel.
2. First leg: (7.5 m/s)(2.4 s) = 18 m east.
3. Second leg: (6.8 m/s)(3.5 s) = 23.8 m east.
4. Total displacement = 18 m + 23.8 m = 41.8 m, which rounds to 42 m east.
_Source: OpenStax Physics (CC BY 4.0), Ch 2 "Motion in One Dimension", section 2.2 Speed and Velocity_
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