Homework Help: physics

Posted by sidney on Wednesday, October 12, 2011 at 1:03am.

A 48.2 kg girl is standing on a 129 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.66 m/s relative to the plank. What is her velocity relative to the ice surface?

physics - drwls, Wednesday, October 12, 2011 at 2:09am
Hint: the center of mass of the plank will stay in the same place as the girl walks along it.

Compute the speed of the plank using this fact. Then do a vector addition of the plank velocity and the girl's velocity relative to the plank (which was given)

Answer this Question

Related Questions

physics - A 48.2 kg girl is standing on a 160. kg plank. The plank, originally ...
physics - A 48.2 kg girl is standing on a 160. kg plank. The plank, originally ...
Physics URGENT!!! - A 41.8 kg girl is standing on a 142. kg plank. The plank, ...
physics - A 45.0 kg girl is standing on a 163 kg plank. The plank, originally at...
Physics - Question Part Points Submissions Used A 45.0-kg girl is standing on a...
physics - A 43.3 kg girl is standing on a 125 kg plank. The plank, originally at...
physics - A 43.3 kg girl is standing on a 125 kg plank. The plank, originally at...
Physics B - Part 1 A 36 kg girl is standing on a 65 kg plank. The plank, ...
Physics - A wooden plank with length L = 7.5 m and mass M = 104 kg is centered ...
Physics - A mass of 60kg is on the edge of a plank. The Plank is 25 m long. ...

For Further Reading

First Name:
School Subject:
Answer: