Introduction to Flight 7th Edition by John Anderson

Exercise 6

Consider a solid iron sphere entering the earth's atmosphere at 8 km/s and at an angle of 30° below the local horizontal. The sphere diameter is 1.6 m. Calculate ( a ) the altitude at which maximum deceleration occurs, ( b ) the value of the maximum deceleration, and ( c ) the velocity at which the sphere would impact the earth's surface.