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Two balls thrown vertically at different times: when or where they meet

This type of question, asked 2 times: 26 Jun 2022, 29 Jun 2022. All 2 questions below, oldest first.

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  1. Question 1

    26 Jun 2022

    111
    A ball is projected vertically upward with an initial velocity of 50 ms−150{\text{ }ms}^{- 1} at t=0 st = 0\text{ }s. At t=2 st = 2\text{ }s. another ball is projected vertically upward with same velocity. At t=t = _____ ss, second ball will meet the first ball (g=10 ms−2)\left( g = 10{\text{ }ms}^{- 2} \right).

  2. Question 2

    29 Jun 2022

    1
    Two balls AA and BB are placed at the top of 180 m180\text{ }m tall tower. Ball A is released from the top at t=0t = 0 s. Ball BB is thrown vertically down with an initial velocity ' uu ' at t=2 st = 2\text{ }s. After a certain time, both balls meet 100 m100\text{ }m above the ground. Find the value of ' uu ' in ms−1ms^{- 1}. [use g=10 ms−2g = 10{\text{ }ms}^{- 2} ] :

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