How fast would the international space station (iss) have to travel to maintain a circular orbit a distance of 1400 km above the earth?

The International Space Station move at 7.22 km/s.

Explanation:

Orbital speed of satellite is given by  , where G is gravitational constant, M is mass of Earth and r is the distance to satellite from centre of Earth.

r = R + h = 6350 + 1400 = 7750 km = 7.75 x 10⁶ m

G = 6.673 x 10⁻¹¹ Nm²/kg²

M = 5.98 x 10²⁴ kg

Substituting

  The International Space Station move at 7.22 km/s.      

momentum of soft ball three times less than baskey ball

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.