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InterviewSolution
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A ball is dropped from a ballon going up at a speed of 7 m/s. If the balloon was at a height 60 m at the time of dropping the ball, how long will the ball take in reaching the ground? |
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Answer» Correct Answer - A::B::C Initially the ball is going upward `u=-7 m/s S=60 a= g= 10 m/s^2 From S=ut+1/2 at^2 60=-7t+1/2 10 t^2 rarr 60=-7t+5t^2 rarr5t^2-7t-60= :. T=(7+-(sqrt(49+1200)))/(2xx5) =(7+-(sqrt(49+1200)))/1 =(-7+-35.34)/10 Taking +ve sign t= (7+35.34)/10=4.2 sec` Therefore, the ball will take 4.2 sec, to reach the ground. |
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