Two balls are dropped from same height at 1 second interval of time. The separation between the ...

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Two balls are dropped from same height at 1 second interval of time. The separation between the two balls after 4 second of the drop of the \( 1^{\text {st }} \) ball is:
a. \( 30 \mathrm{~m} \)
b. \( 35 \mathrm{~m} \)
c. \( 40 \mathrm{~m} \)
d. \( 48 \mathrm{~m} \)
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