A skater weighs 55 kg and he slides in a straight line on a skate, slowing down evenly to rest for 20 m from an initial speed of 16 km/h. If the width of the blade of his skate is 5mm, estimate the maximum depth of the track it will leave behind in the ice? We assumes that the outside temperature is 0C. Data: H fusion of H2O = 1.44 kcal/mole Density of ice = 0.917 g/cm3

Answer: 1,7 x 10- 3 cm