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Home Q & A Board Science-Related Homework Help Physics
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rjay92 rjay92
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Posts: 66
Rep: 2 0
11 years ago
A  50kg  firefighter is standing on a 200kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is flat, frictionless surface. The firefighter begins to walk along the plank at a constant velocity of 2.0m/s to the right relative to the plank.
(a.) What is his velocity relative to the surface of the ice?
(b.) What is the velocity of the plank relative to the surface of the ice?
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3 Replies
Replies
wrote...
#1
11 years ago
He stays still, he just make the plank slide backwards at 2.0 m/s, think about it, what would make the plank move forward?

kinda a trick question Slight Smile
wrote...
#2
11 years ago
If the surface is frictionless then the plank is in equilibrium and it wont move, it could not slide because then there would be kinetic friction. The velocity relative to the ice is 2m/s,  B.) 0m/s.

Not sure is thats right but it makes sense to me.
Answer accepted by topic starter
leslie202leslie202
wrote...
#3
Posts: 10
Rep: 0 0
11 years ago
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