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maw [93]
2 years ago
14

a man can row a boat at 4 km per hour in still water. he rolls the boat two kilometre upstream and 2 kilometre back to a startin

g place in 2 hours how fast is the stream flowing​
Physics
2 answers:
stiv31 [10]2 years ago
5 0

Answer:

I would say since it is still water the stream flow is 0km/h. Especially because he needs the same time upstream as He does down stream.

FromTheMoon [43]2 years ago
3 0

Answer:

sorry I don't give answers

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Explanation:

v= s/t

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V = 8m/s

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What relationship exists between speed, velocity, and acceleration
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A constant force of 12N is applied for 3.0s to a body initially at rest. The final velocity of the body is 6.0ms–1. What is the
sp2606 [1]
From the question,
u = 0m {s}^{ - 1}
v = 6m {s}^{ - 1}

t = 3s
F=12N



Using Impulse, the product of the constant force, F and time t equals the product of the mass of the body and change in velocity.

Ft =m(v-u)


12(3.0)=m(6.0- \: 0)
This implies that

36.0 = 6m
m =  \frac{36.0}{6.0}
\therefore \: m = 6.0kg


You can also use the equation of linear motion,
v = u + at
6 = 0 + a(3)
6 = 3a
a =  \frac{6}{3}

a = 2 {ms}^{ - 2}
But
F=ma
12 = m(2)
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3 years ago
What is a molecule??
Doss [256]

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Explanation:

8 0
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It is used in MRI because it does not damage cells

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