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A ball is dropped from a building. It ta...

A ball is dropped from a building. It takes 4s to reach the ground. The height of the building is (use g = 10 `m//s^(2)` )

A

20 m

B

40 m

C

80 m

D

75 m

Text Solution

Verified by Experts

From equation of motion.
`s = ut + 1/2 at^(2)` s = h : g = a : u = o
`h = 1/2 "gt"^(2)`
`h = 1/2 xx 10 xx (4)^(2)` , h = 80 m
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