(6%) Problem 8: Dave needs to get groceries from the store, which is a distance
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Question
(6%) Problem 8: Dave needs to get groceries from the store, which is a distance D 1.3 km east ofhis house Dave rides his bike to the store at a constant speed ofn 6.9m/s, and rides back to his house at the slower speed ofv-24mi tore ament Status ck here for ailed view House Otheexpertta.com ii! 17% Part (a) How long (in seconds) does it take for Dave to reach the store? 17% Part (b) In seconds, how long does the whole trip take? m Status F4 17% Part (c) How longdoes the trip take in minutes? How much distance, in kilometers, did Dave travel during the whole trip? 17% Part 17% Part (e) what sthe magnitude of Dave's dasplacement, m krn for the entire trip (d) Completed Completed Completed Completed e n rn what is the direction of Dave's displacement for the entire trip? Grade Smmary 0 No direction O East o westExplanation / Answer
a)
distance = 1.8 km = 1800 m
speed = 6.9 m/s
use:
t1 = distance / speed
= 1800 m / 6.9 m/s
= 260 s
Answer: 260 s
b)
lets calculate the time taken to come back
t2 = = distance / speed
= 1800 m / 2.4 m/s
= 750 s
total time = 260 s + 750 s = 1010 s
Answer: 1010 s
c)
t = 1010 s
=1010/60 min
= 17 minutes
Answer: 17 minutes
d)
d = 1.8 km + 1.8 km
= 3.6 km
Answer: 3.6 km
e)
displacement = 0 km because his starting and ending point is same
Answer: 0 km
f)
No direction
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