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3 years ago

What is the velocity of a plane that traveled 3,000 miles from New York to California in 5.0 hours

Physics

1 answer:

Harlamova29_29 [7]3 years ago

8 0

600

mph

Velocity is the distance traveled in a given time, or

where

is velocity,

is distance and

is time.

Here,

3000

and

5.0

, so

3000

600

Don't forget units. Since the question's data is in miles and hours, the units will be miles per hour, or mph, so

3000

miles

hours

600

miles

hour

600

mph

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Answer:

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Explanation:

When an object of mass M is at a height H above the ground, the potential energy of the object is:

U = M*H*g

Where g is the gravitational acceleration, g = 9.8 m/s^2

And for an object with velocity v, the kinetic energy is:

K = (M/2)*v^2

We know that when the flashlight of mass 1kg is 0.7 meters above the ground, the potential energy is equal to the kinetic energy, then:

M = 1kg

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Replacing these in the equations, we get:

U = K

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As the mass factor appears in both sides, we can remove it:

(0.7 m)*(9.8 m/s^2) = (v^2)/2

Now we can multiply both sides by 2:

2*(0.7 m)*(9.8 m/s^2) = v^2

Now let's apply the square root to both sides:

√(2*(0.7 m)*(9.8 m/s^2)) = v = 3.7 m/s

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