Momentum qs

  • Thread starter crosbykins
  • Start date
  • #1
53
0

Homework Statement


A girl of mass 48kg runs toward her sationary 2.0kg skateboard and jumps on. The horizontal velocity of the girl just before she makes contact with the skateboard is 4.0m/s to the right. Disregard the effects of friction.
a)Determine the velocity of the girl after she has landed on the skateboard.
b)The girl then travels at this speed for a short time before jumping off, still traveling at the same speed as the skateboard. What is the velocity of the skateboard after she jumps off.


Homework Equations



p0=pf
(m1)(v01) + (m2)(v01) = (m1)(vf1) + (m2)(vf2)

The Attempt at a Solution


ok for b:
48kg * 4.0m/s = 50kg(v2)----> is this ok to consider skateboard and girl one
v2 =3.84m/s

ok for c) since she jumps off and has the same velocity, that means the skateboard will also have the same velocity
 

Answers and Replies

  • #2
1,986
268
48kg * 4.0m/s = 50kg(v2)----> is this ok to consider skateboard and girl one
v2 =3.84m/s
It's ok to to consider girl and skateboard as one if they have the same velocity, wich
they have. The answer is correct
ok for c) since she jumps off and has the same velocity, that means the skateboard will also have the same velocity
[/QUOTE]
This is OK as well.
 

Related Threads on Momentum qs

  • Last Post
Replies
0
Views
791
  • Last Post
Replies
2
Views
796
Replies
14
Views
2K
  • Last Post
Replies
0
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
9
Views
2K
  • Last Post
Replies
8
Views
1K
  • Last Post
Replies
11
Views
1K
  • Last Post
Replies
9
Views
5K
  • Last Post
Replies
1
Views
748
Top