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Physics question

  • 17-02-2010 12:12am
    #1
    Aidan2160
    Closed Accounts Posts: 5 ✭


    A student drops a ball from height H above the ground ant at the same time someone throws a ball with speed u from a height h from the ground upward vertical to the other ball.

    1 If both objects move in the same vertical line how far from the ground will they meet?

    2 If they have the same speed when they meet find the ratio between the distances travelled by the two balls


    1st one to answer correctly gets the prize of being the best


Comments

  • #2
    Podge_irl
    Moderators, Sports Moderators Posts: 29,055 Mod ✭✭✭✭Podge_irl


    Aidan2160 wrote: »
    1st one to answer correctly gets the prize of being the best

    I imagine a more likely scenario is that first one to answer correctly gets the prize of having done your homework for you.

    What direction does the ball get thrown in? I presume it's upwards. One way to do it would be to get the height of both balls as a function of time - you can do this using the standard velocity equations (v = u +at etc). You will then have the time that they meet at, form which you can find the height (it should be a function of all H, h and u).

    Knowing they both have the same speed means you can equate their speeds at the time they meet. From this you will get a formula for their height.


  • #3
    Aidan2160
    Closed Accounts Posts: 5 ✭Aidan2160


    Podge_irl wrote: »
    I imagine a more likely scenario is that first one to answer correctly gets the prize of having done your homework for you.

    What direction does the ball get thrown in? I presume it's upwards. One way to do it would be to get the height of both balls as a function of time - you can do this using the standard velocity equations (v = u +at etc). You will then have the time that they meet at, form which you can find the height (it should be a function of all H, h and u).

    Knowing they both have the same speed means you can equate their speeds at the time they meet. From this you will get a formula for their height.

    I wouldn't call it homework, and you wouldn't be doing it for me, i've got 2 answers and i wont find out if its correct till next week.... I'd look at it as one problem solver asking for assistance from others


  • #4
    FarmerGreen
    Registered Users, Registered Users 2 Posts: 1,134 ✭✭✭FarmerGreen


    Aidan2160 wrote: »
    A student drops a ball from height H above the ground ant ...
    1st one to answer correctly gets the prize of being the best

    When a student does anything God knows what is going to happen next.
    Do I win the prize?

    >>I'd look at it as one problem solver asking for assistance from others

    I'd look at it as one who cant solve problems asking for assistance from others who can.
    Do some work.


  • #5
    Podge_irl
    Moderators, Sports Moderators Posts: 29,055 Mod ✭✭✭✭Podge_irl


    Aidan2160 wrote: »
    I wouldn't call it homework, and you wouldn't be doing it for me, i've got 2 answers and i wont find out if its correct till next week.... I'd look at it as one problem solver asking for assistance from others

    Well then, show us your workings and we'll tell you were you went right or wrong.


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