First slide

Release from certain height

Question

A body falls from 80 m. Its time of descent is [g = 10 ms^-2]

Moderate

A

3s
B

4 s
C

5 s
D

6 s

Solution

h = 0xt +1/2 gt²
⇒ t =√(2h/g)= √(2x80/10) sec = 4 sec

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