Assume that the athlete approaches the take-off line from the left with a horizontal velocity of 10m/s, remains in contact with the ground for 0.1s, and take off at a 60oangle with a velocity for 10m/s, determine (1) the vertical component of the average impulsive force exerted by the ground on his foot. (2) the horizontal frictional force. The mass of the athlete is 100kg and the coefficient of kinetic friction (μk) is 0.1.