Consult multiple-concept example 5 for insight into solving this problem. a skier slides horizontally along the snow for a distance of 21 m before coming to rest. the coefficient of kinetic friction between the skier and the snow is k0.050. initially, how fast was the skier going?

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?