Answer:
The orbital velocity is 9741.6 m/s.
Explanation:
The orbital velocity can be calculated using the formula v = √(GM/r), where G is the gravitational constant, 6.674*10^-11 m^3/kgs^2, M is the mass of the earth, 5.972*10^24 kg, and r is the radius, which we're given to be 4200 km, however to get the correct units in the end we must convert this to meters by multiplying by 1000, so r = 4200000 = 4.2*10^6 m.
Plugging these values into the formula, we get v = √(6.674*10^-11*5.972*10^24/(4.2*10^6)) ≈ √94897923 ≈ 9741.6 m/s
