Question

An aeroplane is moving on a circular path with a speed $250km{h}^{-1}$. What is the change in velocity in half revolution?

• A. 0
• B. $125km{h}^{-1}$
• C. $250km{h}^{-1}$
• D. $500km{h}^{-1}$

Answer 1

The correct option is D $500km{h}^{-1}$

let us consider its initial velocity as $+250km/hr$. after half revolution its speed remains same but the direction is opposite.Thus, velocity is $-250km/hr$. Thus the change in velocity is $(-250)-(+250)=-500$. Thus, the magnitude of the change in velocity is $500km/hr$.