Why are high speed moving object flickering for rendering time

I am new for unity3d .i started with standard Air hockey game,but when Puck moving on board at max speed 40 unit/sec,then at rendering time Puck is look like flickering (jerking) . At lower speed (<15 units/second), puck visibility is proper but at high speed its blur.
If anyone getting idea Please help

Real air hockey is too fast to use simple rendering of objects. You will need to simulate motion blur in some way to make it visible. TrailRenderer may be sufficient.