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At 8 o clock, a pendulum starts striking and after 9 seconds the strike is finished. For how much time would a pendulum strike at 11 o clock if it is known that the pendulum strikes 3 times at 3 o'clock, 4 times at 4 o'clock and so on?
  • a)
    90/7
  • b)
    90/8
  • c)
    99/7
  • d)
    99/8
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
At 8 o clock, a pendulum starts striking and after 9 seconds the strik...
At t=0, the pendulum strikes for the 1st time.
At t = 9, the pendulum strikes for the 8th time.
So between 1st strike and 8th strike, the pendulum completes 7 rounds. 
It takes 9 seconds to complete 7 full rounds
It takes 9/7 seconds to complete 1 full round.
At 11 o clock, the pendulum will strike 1st at t=0 and then it will complete 10 rounds.
Time taken to strike 11 o clock = 10*9/7= 90/7 seconds.
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At 8 o clock, a pendulum starts striking and after 9 seconds the strike is finished. For how much time would a pendulum strike at 11 o clock if it is known that the pendulum strikes 3 times at 3 oclock, 4 times at 4 oclock and so on?a)90/7b)90/8c)99/7d)99/8Correct answer is option 'A'. Can you explain this answer?
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