Derivation of Position-Time Relation by Graphical Method
A ball is dro...
Question
A ball is dropped downwards, after 1 sec another ball is dropped downwards from the same point. What is the distance between them after 3 sec? (Take g=10ms−2)
A
20m
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B
25m
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C
50m
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D
9.8m
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Solution
The correct option is B25m Distance at a given time is given by equation, S=ut+12at2 For first body, u1=0,S=S1,a=g,t1=3sec ∴S1=12g×9 For second body, u2=0,S=S2,a=g,t2=2sec ∴S2=12g×4 So difference between them after 3sec=S1−S2 =12g×5 Ifg=10m/s2 then S1−S2=25m