A = 15, B = 1
48 + 15 = 63 for the first 86km
43 - 1 = 42 for the remaining 54 km
time = distance/speed
t1 = 86/63 = 1.3651hours
t2 = 54/42 = 1.2857hours
speed = distance/time
s = 140/2.6508
average speed = 52.8km/h
<u>A hot stop</u> is the feature that <span>may form in an intraplate area over a rising plume of hot mantle material.
According to a dictionary, this is the definition of a hot spot:
</span>A place deep within the Earth where hot<span> magma rises to just underneath the surface, creating a bulge and volcanic activity.</span>
Answer:
The new speed must be 
Explanation:
In order for the satellite to be on a stable orbit around the planet, the gravitational attraction must be equal to the centripetal force that keeps the satellite in circular motion:

where G is the gravitational constant, M is the mass of the planet, m is the mass of the satellite, V0 the speed of the satellite at distance R from the center of the planet.
We can re-write V0, the initial satellite speed, by re-arranging the equation:

Now, if we want the satellite to orbit at a distance of 2R, the new tangential speed must be:

Answer:
What constant velocity means
Explanation:
To have a constant velocity, an object must have a constant speed in a constant direction