Question

2. An artificial satellite moves around earth with a velocity of constant magnitude still Its motion is said to be accelerated motion. why? ONE MARK

Answer 1

because it's direction is changing constantly and at every instant

Answer 2

All the objects performing revolution around earth is freely falling towards the center of the earth. It actually moves in straight line but due to gravity its path is curved and it appears to be moving around the earth. Look at the image for better understanding. So, because the satellite is falling freely under the influence of gravity, hence the motion is accelerated.