Question

45. If water drops are falling at regular
time intervals from ceiling of height H,
then position of drop from the ceiling is
(when nth drop falling from the ceiling and
rth drop is in its way)
(n-1)
(n-r)?
1)
H
2)
H
(n-1)2
(n-r)2
3)
(n-1)
H
(n+1)?
4)
(n+1)
H
(n +r)?​

Answer 1

Answer:

From the diagram

Number of interval during drop movement is 5

Time interval in two consecutive drop is 0.5sec

Total time, 5×t=5×0.5=2.5sec

Apply kinematic equation of motion

s=ut+

2

1

at

2

s=0+

2

1

9.8×2.5

2

=30.62m

Hence, height of celling is 30.62m