- #1
LD_90
- 11
- 0
I'm doing some problems from an old text that seems to be plagued with errors in the answer key. I think my method is correct, but if someone could confirm my answers to this problem, I'd very much appreciative.
Two girls sit on opposite ends of a sled 6.0 m long initially at rest on frictionless ice. Each girl has a mass of 50 k; the sled's mass is 30 kg. The girl at one end throws a 4.0 kg object to the other girl so that the obect travels horizontally at 5.0 m/s relative to the ice. What is the sled's speed (a) before the second girl catches the object? (b) After she catches the object? (c) Over what distance does the sled move while the object is in flight?
My answers (a) 0.15 m/s (b) 0 m/s (c) 0.18 m
The books answers (a) 1/6 m/s (b) 0 (c) 6/31m
Two girls sit on opposite ends of a sled 6.0 m long initially at rest on frictionless ice. Each girl has a mass of 50 k; the sled's mass is 30 kg. The girl at one end throws a 4.0 kg object to the other girl so that the obect travels horizontally at 5.0 m/s relative to the ice. What is the sled's speed (a) before the second girl catches the object? (b) After she catches the object? (c) Over what distance does the sled move while the object is in flight?
My answers (a) 0.15 m/s (b) 0 m/s (c) 0.18 m
The books answers (a) 1/6 m/s (b) 0 (c) 6/31m