Physics

I have some physics problems that I would like to get checked please?

asked by Jesse
  1. 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





    posted by Jesse
  2. 1. Yes, if the energy is not kinetic

    3 and 4

    In both cases V = sqrt(2gH)= 24.2 m/s

    posted by drwls
  3. 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?

    posted by amber

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