Max Ball Height: No Mass Needed

  • Thread starter jaron
  • Start date
  • #1

Homework Statement

you throw a ball directly upward, giving it an initial velocity of 10.0 m/s. neglecting friction, what would be the maximum height of the ball? (explain why you do not need to know the mass of the ball)

Homework Equations

now the problem itself i understand.

we need Eg=mgh, Ek=1/2mv^2

The Attempt at a Solution

1/2mv^2 = mgh
1/2v^2 = gh
1/2(10.0)^2 = 9.81h
50/9.81 = h
h = 5.1m

i understand that we do not have mass and so it must cancel out, but i am confused as to why we do not need to know the mass?
  • #2
What falls faster a feather or a cannon ball? (this problem assumes 0 resistance)
  • #3
neglecting air friction, neither..
meaning mass doesn't matter
  • #4
So you're saying that gravity accelerates all masses in an equal manner. This is correct. What is the one force acting upon the ball after you release it?
  • #5
only gravity (in this instance because it says to neglect friction)
  • #6
Yes, do you understand now why you don't need to know the mass of the ball?
  • #7
i understand.
thank you

Suggested for: Max Ball Height: No Mass Needed