2 In the sport of curling, a heavy stone is projected across a horizontal ice surface. One player projects a stone of weight 180 N , which moves 36 m in a straight line and comes to rest 24 s after the instant of projection. The only horizontal force acting on the stone after its projection is a constant frictional force between the stone and the ice.

1. Calculate the deceleration of the stone.
2. Find the magnitude of the frictional force acting on the stone, and calculate the coefficient of friction between the stone and the ice.