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Ball dropped from a height

  1. Oct 11, 2014 #1
    1. The problem statement, all variables and given/known data
    A ball is dropped from a height of 5meters
    a) what is the velocity of the ball when it reaches the ground ? explain

    2. Relevant equations
    velocity = displacement /time


    3. The attempt at a solution
    the velocity is increasing due the gravitation of earth (as 9.8m/s) the ball is at a height of 5meter
    is there any factor related to this ?
     
  2. jcsd
  3. Oct 11, 2014 #2

    phinds

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    What do you mean "is there any factor related to this?". That IS the factor you want to take into consideration. You have the starting height and you have the acceleration due to gravity. You don't need anything else. Do you understand the equation of ballistic motion in a gravitational field?
     
  4. Oct 12, 2014 #3

    Andrew Mason

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    Welcome to PF hafiz ns.

    There are several ways of approaching this: Using energy, you can determine the speed from the change in potential energy; By finding t first and finding average velocity from your equation (average velocity = displacement/time), then using the relationship between final and average velocities; You could also find t and use the relationship between acceleration, velocity and time.

    AM
     
    Last edited: Oct 12, 2014
  5. Oct 12, 2014 #4
    hafiz, to answer your question: yes, there is a factor to do with the acceleration. So think about how acceleration affects the velocity of the ball with time.
     
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