CBSE Class 11-science Answered
Pls solve it.
Asked by pb_ckt | 07 Jun, 2019, 01:43: PM
Expert Answer
Seeing from elevator which is moving upwards with acceleration 0.2 m/s2 , acceleration of stone is 9.8+0.2 = 10 m/s2
hence if stone has to travel a distance 20 m, then we have S = (1/2)a t2 or 20 = (1/2)×10×t2 or t = 2 s
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