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     EduGorilla 
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    A boy throws a ball of mass 4 kg vertically downwards for a height of 20 metres. What is the velocity of the ball which touches the ground? (Take g= 10 m/s2)

    Options :-

    1. 20 m/s
    2. 25 m/s
    3. 30 m/s
    4. 18 m/s
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