Posted by Jesse on Sunday, September 23, 2007 at 9:23pm.
I have some physics problems that I would like to get checked please?

Physics  Jesse, Sunday, September 23, 2007 at 9:25pm
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 doesnâ€™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

Physics  drwls, Sunday, September 23, 2007 at 10:40pm
1. Yes, if the energy is not kinetic
3 and 4
In both cases V = sqrt(2gH)= 24.2 m/s

Physics  amber, Thursday, October 6, 2011 at 7:49pm
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?
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