A bird flies 6 km towards east, and then flies 8 km towards north. If the magnitude of its average velocity for the entire motion is 15 m/s, find its average speed during this period.
Answers
21 m/s
Explanation:
here displacement = sqrt( 8^2+6^2)=10
time taken= 10/15=2/3 s
average speed=distance travelled / time taken
distance travelled= 6+8=14 m
avg speed= 14/(2/3)=14*3/2=21 m/s
Answer: 21 m/s
Explanation:
1) First, lets calculate the displacement of the bird, which can be x
6 square + 8 square = x square
which is, 36 + 64 = x^2 = 100
displacement = 10km = 10,000m
2) We know the avg velocity is 15m/s, and we know the displacement
with this, we can find the time
Time = Displacement / AVG velocity
Time = 10,000 / 15
This value has way too much decimal points and is hard to find,
hence we will use the fraction form, "10,000/15"
3) Now we know everything to find the average speed
avg speed = distance / time
(distance = 8km + 6km = 14km or 14,000m)
avg speed = 14000 / (10000/15)
we can write this as,
avg speed = 14000 * 15 / 10000
= 21 m/s
answer: 21m/s
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