First slide

Release from certain height

Question

A person in lift which ascends up with acceleration 10 m $s^{- 2}$ drops a stone from a height 10 m. The time of descent is [g=10ms-2]

Moderate

A

1 s
B

2 s
C

1.5 s
D

3 s

Solution

$\large T = \sqrt {\frac{{2h}}{{(g + a)}}} = \sqrt {\frac{{2 \times 10}}{{10 + 10}}} \Rightarrow T = 1s$

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