The velocity of a bullet is reduced from $200\,m/s$ to $100\,m/s $ while travelling through a wooden block of thickness $10\,cm$. Assuming it to be uniform, the retardation will be
- [AIIMS 2001]
- A$10 \times {10^4}$ $m/s^2$
- B$12 \times {10^4}$ $m/s^2$
- C$13.5 \times {10^4}$ $m/s^2$
- D$15 \times {10^4}$ $m/s^2$
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Two cars leave one after the other and travel with an acceleration of $0.4\, m/s^2$. Two minutes after the departure of the first, the distance between the cars becomes $1.9\, km$. The time interval between the departures of the cars is ........$s$
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- [AIPMT 1994]
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