Question

An aeroplane is moving in a circular path with a speed 250 km/hr; what is the change in velocity in half revolution –

• A. 500 km/hr
• B. 250 km/hr
• C. 125 km/hr
• D. Zero

Answer 1

Answer: (A)

500 km/hr

Answer 2

$\overset{\rightarrow}{\Delta V}$ = $\overset{\rightarrow}{V_{f}}$ – $\overset{\rightarrow}{V_{i}}$

|$\overset{\rightarrow}{\Delta V}$| = |$\overset{\rightarrow}{V_{f}}$ – $\overset{\rightarrow}{V_{i}}$| = 500 km/hr

[Q V_f = V_i = 250 km/hr and q = 180⁰