Nils Lied, an Australian meteorologist, once played golf on the ice in Antarctica and drove a ball a horizontal distance of 2400 m. For a rough estimate, let us assume that the ball took off at θ = 45°, flew a horizontal distance of 200 m without air resistance, and then slid on the ice without bouncing, its velocity being equal to the horizontal component of the initial velocity. Estimate the coefficient of kinetic friction µk between the ice and ball.