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.A stone, allowed to fall under gravity falls 5t^2 metresin t seconds. Find the distance travelled by the stonein the last two seconds before it reaches the ground,if the stone is dropped from a height of 180 m.(A) 30 m (B) 60 m (C) 100 m (D) 90 m |
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Answer» Answer: a)30m b)60m c)100m d)90m MyApproach: I am not able to think logically how to USE the FORMULA to solve the problem. Given, 1/2 g . t2=5t2 5t2= 180 =>t=6 To calculate the distance in the LAST 2 sec I did 5 . (6)2-5 . (4)2=100m |
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