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Shane Macguire Grade: upto college level
         A person sitting on the top of a tall building is dropping balls at regular intervals of one second. Find the positions of the 3rd. 4th and 5th ball when the 6th ball is being dropped.
3 years ago

Answers : (1)

Deepak Patra
askIITians Faculty
474 Points
										Sol. For every ball, u = 0, a = g = 9.8 m/s2

∴ 4th ball move for 2 sec, 5th ball 1 sec and 3rd ball 3 sec when 6th ball is being dropped. For 3rd ball
t = 3 sec

S3 = ut + ½ at2 0 + ½ (9.8) 32 = 4.9 m below the top.

For 4th ball, t = 2 sec
S2 = 0 + 1/2 gt2 = 1/2 (9.8)22 = 19.6 m below the top (u = 0)
For 5th ball, t = 1 sec
S3 = ut + 1/2 at2 = 0 + 1/2 (9.8)t2 = 4.98 m below the top.
3 years ago
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