Posted by **Mary** on Saturday, March 3, 2007 at 1:44am.

Please tell me where I am going wrong.

A 59.5 kg person, running horizontally with a velocity of +3.90 m/s, jumps onto a 12.2 kg sled that is initially at rest.

(a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away.

m/s

(b) The sled and person coast 30.0 m on level snow before coming to rest. What is the coefficient of kinetic friction between the sled and the snow?

m1= 59.5kg

v01= 3.90 m/s

m2= 12.2 kg

v02= 0

vf= (59.5kg x 3.90m/s)+ (12.2m/s x 0)/ (59.5kg + 12.2 kg)= 244.25m/s /71.7= 3.41 m/s

It looks like you calculated Vf correctly.

For the coefficient of friction, set the initial kinetic energy equal to the work done against fraction.

(1/2)Mtotal*Vf^2 = Mtotal*g*(mu,k)*X

mu,k = Vf^2/(2 g X)= ?

- Physics- drwls please help -
**tu papi **, Friday, September 18, 2015 at 9:09am
2

## Answer this Question

## Related Questions

- physics - A 60.0 kg person, running horizontally with a velocity of 3.80 m/s, ...
- Physics - A 60.5-kg person, running horizontally with a velocity of +3.76 m/s, ...
- physics - A 58.4-kg person, running horizontally with a velocity of +3.84 m/s, ...
- Physics - A 59.5 kg person, running horizontally with a velocity of +3.90 m/s, ...
- AP Physics - I have two problems i don't understand if you could solve and show ...
- Physics - A 45 kg boy running at 3 meters per second jumps on to a 97 kg sled ...
- PHYSICS HELP !!!!! - A 55 kg person runs with a horizontal velocity of 8.0 m/s ...
- physics - A 65 kg person runs with a horizontal velocity of 3.5 m/s and jumps ...
- Highschool Physics - A 55 kg person runs with a horizontal velocity of 8.0 m/s ...
- Physics URGENT!!! - Gayle runs at a speed of 9.00 m/s and dives on a sled, ...

More Related Questions