A person of mass 75 kg is standing on a sled of mass 150 kg. Thesled sits at res

Question

A person of mass 75 kg is standing on a sled of mass 150 kg. Thesled sits at rest on a very slick, icy pond. The person begins towalk along the sled with a velocity of +6 m/s with respect to thesled. What happens to the sled after the person starts walking?
a. the sled moves in the opposite direction with velocity of -2m/s
b. the sled moves in the same direction with a velocity of +4m/s
c. the sled moves in the opposite direction with a velocity of -4m/s
d. the sled moves in the same direction with a velocity of +3m/s
e. the sled moves in the opposite direction with a velocity of -3m/s

I wasn't sure whether to use m1v1 = m2v2 or m1v1 = (m1 + m2)v2

Explanation / Answer

m1v1+m2v2=0 , so m1v1=-m2v2 and v2= -3 m/s

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