A Hockey Puck Is Seen Moving North Over a Frozen

Multiple Choice

A hockey puck is seen moving north over a frozen pond at a speed of 2m/sec.A while later it is seen moving west at 2m/sec.Which of the following correctly describes the forces acting on the puck?

A) A force has acted,since the direction has changed
B) No force has acted,since the speed is the same
C) A force has acted,but only in a northward direction
D) The above information is insufficient to tell if forces have acted