A spacecraft of mass 150 kg is launched into an orbit at a height of 800 km above the earth's surface. What is the kinetic energy of the spacecraft in orbit?

Here are the solutions to the questions:

10. A spacecraft of mass 150 kg is launched into an orbit at a height of 800 km above the earth's surface. What is the kinetic energy of the spacecraft in orbit?

Step 1: Identify the given values and constants.

• Mass of spacecraft, $m = 150$ kg
• Height above Earth's surface, $h = 800$ km $= 800 \times 10^3$ m
• Gravitational constant, $G = 6.674 \times 10^{-11}$ N m$^2$ kg$^{-2}$
• Mass of Earth, $M_E = 5