Conservation of Momentum of roller-skates

AI Thread Summary
In the discussion, participants analyze an inelastic collision scenario involving Anthony and Sissy during a roller-skating event. Anthony, weighing 75kg, skates backwards at 3m/s, while Sissy, weighing 60kg, jumps into his arms at 5m/s. The conservation of momentum is applied to calculate their combined velocity after the collision, resulting in a final velocity of approximately 3.9 m/s. The calculation is confirmed as correct, with a note on the importance of rounding. The discussion emphasizes the application of momentum conservation in inelastic collisions.
HeyyMarco
Messages
6
Reaction score
0

Homework Statement


Anthony and Sissy are participating in the "Roll-a-Rama" roller-skating dance championship. While 75kg Anthony roller-skates backwards at 3m/s, 60kg Sissy jumps into his arms with a velocity of 5m/s in the same direction.
m1= 75kg
v1= 3m/s
m2= 60kg
v2= 5m/s
v' = ?

Homework Equations



The inelastic collision equation possibly?

The Attempt at a Solution


(75kg)(3m/s) + (60kg)(5m/s)= (75kg+60kg)x
225kg*m/s + 300kg*m/s= 135kg(x)
525kg*m/s = 135kg(x)
(525kg*m/s)/135kg = x
3.8m/s= x

Is that correct?
 
Physics news on Phys.org
Yes, it is inelastic collision and your calculation is correct, but take care of rounding. x=3.888... round it to 3.9 m/s.

ehild
 
ehild said:
Yes, it is inelastic collision and your calculation is correct, but take care of rounding. x=3.888... round it to 3.9 m/s.

ehild

Thank you very much :)
 
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Struggling to make relation between elastic force and height'

Thread 'Struggling to make relation between elastic force and height'

Hello guys this is what I tried so far. I used the UTS to calculate the force it needs when the rope tears. My idea was to make a relationship/ function that would give me the force depending on height. Yeah i couldnt find a way to solve it. I also thought about how I could use hooks law (how it was given to me in my script) with the thought of instead of having two part of a rope id have one singular rope from the middle to the top where I could find the difference in height. But the...
View full post »

Similar threads

Conservation of Energy with changing masses on ice
Replies
2
Views
1K
Ice Skating conservation of momentum (conceptual problem)
Replies
5
Views
4K
Two dimensional momentum problem
Replies
20
Views
3K
Conservation of Momentum question (find final velocities)
Replies
13
Views
4K
Conservation of Momentum law problem
Replies
11
Views
2K
Confusion with "explosive" part, Conservation of Momentum
Replies
6
Views
2K
Conservation of momentum & energy
Replies
11
Views
2K
Calculate recoil velocity using conservation of momentum
Replies
4
Views
5K
Conservation of momentum - with understanding
Replies
2
Views
2K
Momentum conservation: block-wedge problem
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top