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3 years ago

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A 55 kg person moves at the constant speed of 7 m/s along a straight stretch of track for 20s. How far does he travel in this ti

me ?

1 answer:

crimeas [40]3 years ago

6 0

By definition,
Distance = Speed * Time

Therefore the distance traveled is
(7 m/s)*(20 s) = 140 m

Answer: 140 m

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Which substances resist pH changes? <br> Acids<br> Hydrogen ions<br> Buffers<br> Bases

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The correct choice is Buffers.

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Two objects, A and B, are in contact with one another. Initially, the temperature of A is 50 °C and the temperature of B is 100

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Answer:

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3 years ago

Mr. Miles zips down a water-slide starting at 15 m vertical distance up the scaffolding. Disregarding friction, what is the velo

lilavasa [31]

Answer:

The velocity of the Mr. miles is 17.14 m/s.

Explanation:

It is given that,

Mr. Miles zips down a water-slide starting at 15 m vertical distance up the scaffolding, h = 15 m

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$v=\sqrt{2gh}$

g is the acceleration due to gravity

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3 years ago

f an arrow is shot upward on the moon with velocity of 35 m/s, its height (in meters) after t seconds is given by h(t)=35t−0.83t

inysia [295]

Answer:

The velocity of the arrow after 3 seconds is 30.02 m/s.

Explanation:

It is given that,

An arrow is shot upward on the moon with velocity of 35 m/s, its height after t seconds is given by the equation:

$h(t)=35t-0.83t^2$

We know that the rate of change of displacement is equal to the velocity of an object.

$v(t)=\dfrac{dh(t)}{dt}\\\\v(t)=\dfrac{d(35t-0.83t^2)}{dt}\\\\v(t)=35-1.66t$

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$v(t)=35-1.66t\\\\v(t)=35-1.66(3)\\\\v(t)=30.02\ m/s$

So, the velocity of the arrow after 3 seconds is 30.02 m/s. Hence, this is the required solution.

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3 years ago