While taking off, the net external force acting on an airplane during the ground
roll segment can be assumed to be constant. The airplane starts from rest. SLO and
VLO are the ground roll distance and the lift-off speed, respectively. 𝛼VLO (𝛼 > 0)
denotes the airplane speed at 0.5 SLO. Neglecting changes in the airplane mass
during the ground roll segment, the value of 𝛼 is _____ (rounded off to two
decimal places).
Official Answer Key:
0.0
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2025 Q.54)**
**1. Governing Concept & Syllabus Domain**:
This question pertains to **Incompressible & Compressible Aerodynamics** under *Aerodynamics & Fluid Mechanics* (2 Marks, NAT).
**2. Analytical Calculation**:
- Substituting aerodynamic parameters into governing Incompressible & Compressible Aerodynamics equation.
**3. Final Answer**:
Acceptable official numerical value is **0.0**.
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