Finding Final Velocity of Skaters

AI Thread Summary
To find the final velocity of two skaters after a leap, the conservation of momentum principle is applied. The initial momentum of the 60.0 kg skater, moving at 4.00 m/s, is calculated before the leap. After the leap, the combined mass of both skaters is considered to determine their final velocity. Additionally, the discussion highlights the need to calculate the kinetic energy lost during the interaction. The focus remains on using momentum conservation to solve for the final velocity and energy loss.
goldgirl778
Messages
1
Reaction score
0

Homework Statement


During an ice show, a 60.0 kg skater leaps into the air and is caught by an intially stationary 75.0 kg skater.


Homework Equations


What is their final velocity assuming negligible friction and that the 60.0 kg skater's original horiziontal velocity is 4.00 m/s?

How much kinetic energy is lost?


The Attempt at a Solution



I need an equation for the final velocity calculation.
 
Physics news on Phys.org
Look up conservation of momentum
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top