Answer:
38 kg
Explanation:
Newton's Third Law tells us that if skater 1 exerts a force on skater 2 then skater 2 exerts an equal but opposite force on skater 1. Since ΔP = FΔt then the change in momentum of both must also be equal since the the magnitude of the force they experience is also equal.
change in momentum of skater 1 = change in momentum of skater 2
48 kg * (0.69 m/s - 0 m/s) = m * (0.87 m/s - 0 m/s)
m = 38 kg
