A stationary skateboarder 1 with a mass of 80 kg pushes a stationary skateboarder 2 with a mass of 60 kg. after the push the skateboarder 2 moves with a velocity of 4 m/s to the right. what is the velocity of skateboarder 1?

a : 3 m/s to the left
b: 5 m/s to the left
c : 1 m/s to the right
d : 3 m/s to the right.



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