Question

An aeroplane is moving around a circular path with a speed 250 km per hour.What is the change in its velocity after moving through half circle . * 500 km per hr 250 km per hr 125 km. per hr Zero

Answer 1

Explanation:

See below

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