Wes stands on the roof of a building, leans over the edge, and drops a rock. lindsay waits 1.20 s after wes releases his rock and throws her own rock straight down at 21.0 m/s. both rocks hit the ground simultaneously. 1) calculate the common height from which the rocks were released. ignore the effects of air resistance. (express your answer to three significant figures.)

11.875 m

Explanation:

Given

initial  speed of wes ball()=0 m/s

initial  speed of Lindsay ball()=21 m/s

let Height of building be h m

Consider vertical motion

here initial vertical velocity is zero and wes drop 1.2 s earlier than Lindsay

For Lindsay

Equating (1) & (2) we get

42t=1.44g+2.4t

39.6t=1.44g

Putting this value in (1)

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