Conservation of energy problem

  • Thread starter boognish
  • Start date
  • #1
15
0
1. a student throws a ball down with an initial velocity of 5.0 m/s from a point 8.0 m above the base of a track. Find the speed of the ball as it hits the base of the track. The track is designed to losslessly change the direction of the ball up a frictionless ramp. What is the height above the ground reached by the ball



2. K = 1/2 mv^2
U = mgh
E1 = E2




3. If I knew the mass of the ball this problem would be easy
U = mgh
K= 1/2 mv^2
mgh(initial) + 1/2mv^2(initial) = mgh(final)
I dont have the mass
is there an equation that I can sub into the above to isolate the mass or is mass irrelevant as it is on both sides of the equation?

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
cepheid
Staff Emeritus
Science Advisor
Gold Member
5,192
38
Well, of course if the mass is on both sides of the equation, it cancels
 

Related Threads on Conservation of energy problem

  • Last Post
Replies
2
Views
768
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
2
Views
862
  • Last Post
Replies
17
Views
1K
  • Last Post
Replies
1
Views
789
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
813
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
8
Views
1K
  • Last Post
Replies
4
Views
1K
Top