First slide

Release from certain height

Question

A splash is heard 3.12s after a stone is dropped into a well 45 m deep. The speed of sound in air is [g = 10 ms^-2]

Easy

A

330ms^-1
B

375ms^-1
C

340ms^-1
D

346ms^-1

Solution

$\large time\;of\;fall = \sqrt {\frac{{2h}} {g}} \Rightarrow t = \sqrt {\frac{{2 \times 45}} {{10}}} = 3$
remaining time = 3.12 - 3 = 0.12 sec
speed = 45 /0.12 = 375 ms^-1

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