Physics
posted by Jesse
I have some physics problems that I would like to get checked please?

Jesse
1.Can something have energy without having momentum?
No, it can have P.E. and no K.E., however if the object has no K.E. then it doesn’t have no velocity therefore it has no momentum.
3. If a 20 kg object fell to the surface of the Earth from a height of 30 m, what would its final velocity be? (work this problem from the standpoint of linear motion.)
I got 24.23 m/s
4. If a 20 kg object fell to the surface of the Earth from a height of 30m, what would its final velocity be? (work this problem from the energy standpoint.) Should you get the same answer as you did in question 3? (This one I am not too sure)
I got 39.60 m/s 
drwls
1. Yes, if the energy is not kinetic
3 and 4
In both cases V = sqrt(2gH)= 24.2 m/s 
amber
If a 20 kg object fell to the surface of the Earth from a height of 30m, what would its final velocity be? (work this problem from the energy standpoint.) Should you get the same answer as you did in question 3? how do you work out this problem?
Respond to this Question
Similar Questions

physics
hey i have a some questions i am trying to solve for practice, because i have a test coming up. can you guys help me with them? 
Algebra problems
I have some problems that I would like checked please. Find and simplify the difference quotient f(x+h)f(x)/h, h can not equal 0 for the given functions. 1. f(x)=x^2+3x+9 I got 2x+h+3 Evaluate the piecewise function at the given … 
Physics Homework
I have a few questions that I don't understand and would like to get checked, please? 
General
Please understand that I am not upset with anyone or whatever I just want to know something. I have some work to be checked and the regular tutors here say that "we will be happy to critque your thinking" right? 
science
What would happen if the temperature of the tundra increased by 20*F? 
Physics
A 56.6kg hiker starts at an elevation of 1270m and climbs to the top of a 2660 peak. (I know the answers to B and C, I just have a question on A) A) What is the change in the hikers potential energy? 
math
So I've been having trouble solving some problems. Mainly problems that look like this 5(t+3)=1+2(t3) what causes problems is the 5 part. I asked my teacher for help, and he gave me a hint, which is to distribute a 1 like 5+(1)(t)+(1)(3) … 
SciencePhysics
The metre was originally defined as a fraction of the distance from the North Pole to the equator. What problems would this definition of the metre create for people? 
math
It certainly pays to check your work! I just took a HUGE science test. I checked it over twice before I turned it in, and got an A! My score was 94 out of 100! I figure that each time I checked it, I found half of the mistakes that … 
algebra
I have a few math questions I made them just like my actual problems so that I can go through the steps you have went through to answer my own problems...Again THESE ARE NOT THE REAL PROBLEMS JUST EXAMPLES LIKE MINE WITH DIFFERENT …