Posted by James on Sunday, February 27, 2011 at 12:29pm.
A 16kg child sits on a 5kg sled and slides down a 143meter, 30degree slope, to the nearest m/s what is his or her speed at the bottom?

Physics  drwls, Sunday, February 27, 2011 at 1:07pm
They want you to neglect friction and use conservation of energy. The masses will not affect the result.
g*L*sin30 = V^2/2
L = 143 m
g = 9.81 m/s^2
Solve for V, and round to nearest m/s
The m/s number that you get will correspond to well over 100 miles per hour  a very unsafe value.
There will actually be appreciable friction unless they are on an icecovered luge run, and using no brakes or foot dragging.
This is a rather unrealistic problem.

Physics  James, Sunday, February 27, 2011 at 3:21pm
THANKYOU

Physics  James, Sunday, February 27, 2011 at 3:26pm
Thank you drwls, there is another question that I am not getting really well right now. It is this: Two skaters are in the exact center of a circular frozen pond. Skater 1 pushes skater 2 off with a force of 100 N for 1.4 seconds. If skater 1 has a mass of 30 kg and skater 2 has a mass of 74 kg, what is the relative velocity (v1  v2) after the push to the nearest hundredth of a m/s? After reaching the other shore, how fast, to the nearest tenth of a m/s, must skater 1 run around the lake to meet skater 2 at the opposite shore?
Thanks
Answer This Question
Related Questions
 Physics  A 45 kg child sits on a 5 kg sled and slides down a 117 meter, 31 ...
 Physics  A 45 kg child sits on a 5 kg sled and slides down a 117 meter, 31 ...
 physics  A child on a sled (total mass 41 kg) slides down a hill inclined at an...
 physics  A 2 kg metal plate slides down a 14meter high slope. At the bottom ...
 physics  A child and sled with a combined mass of 59.0 kg slide down a ...
 physics  A child and sled with a combined mass of 50.0 kg slide down a ...
 physics  A 2 kg metal plate slides down a 11meter high slope. At the bottom ...
 physics  A child and a sled have a combined mass of 87.5 kg slides down a ...
 Physics  A child who has a mass of 17 kg slides down a slide from a height of 3...
 Physics  On a cold winter morning, a child sits on a sled resting on smooth ice...
More Related Questions