The International Space Station (ISS) orbits Earth at an altitude of 360 km above Earth's surface. The acceleration required keep the ISS in orbit along a circular path is provided by Earth's gravity, which is directed toward the center of Earth and hence toward the center of the orbit. Earth's gravitational pull decreases gradually with altitude, so the acceleration due to gravity that is exerted on the ISS is only 8.78 m/s. (a) What is the orbital speed of the ISS in meters per second?

(b) Kilometers per hour?

(c) And miles per hour?

How long (in minutes) does it take the ISS to complete an orbit? (Note that the radius of Earth is 6378 km].