JEE Mains · Physics · STD 11 - 2. motion in straight line
Water drops fall from a tap on the floor, 5 m below, at regular intervals of time, the first drop strikes the floor when the sixth drop begins to fall. The height at which the fourth drop will be from ground, at the instant when the first drop strikes the ground is ___________ m.
\(\left( g =10 m / s ^2\right)\)
- A 2.5
- B 4
- C 4.2
- D 3.8
Answer & Solution
Correct Answer
(C) 4.2
Step-by-step Solution
Detailed explanation
Time to reach ground \(= \sqrt{\frac{2h}{g}} = \sqrt{\frac{2 \times 5}{10}} = 1 sec\) Five drops per second Time between each drop \(= 0.2\ sec.\) Time of fall for \(4^th\) drop is \(1 - 0.6 = 0.4\ sec\) Height fall of \(4^th\) drop is…
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