Question

What is the change in velocity when a ball hits a wall with velocity of 10m/s and rebounces with the same?

Answer 1

Answer:

initial velocity(u)=30m/s   final velocity(v)=(-30)m/s (-ve sign becuase the ball's dircn is in opposite of initial velocity)  

change in velocity=final velocity-inital veloc.=30-(-30)=60m/s