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A ball is thrown vertically upwards with speed u from the top of a tower reaches the ground in 9 seconds.Another ball is thrown vertically downwards from the same position with same speed u takes 4 sec to reach ground. Calculate the value of u. Please please please help ๐Ÿ™๐Ÿ™๐Ÿ™๐Ÿ™

A ball is thrown vertically upwards with speed u from the top of a tower reaches the ground in 9 seconds.Another ball is thrown vertically downwards from the same position with same speed u takes 4 sec to reach ground. Calculate the value of u. Please please please help ๐Ÿ™๐Ÿ™๐Ÿ™๐Ÿ™

Grade:9

2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
4 years ago
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Khimraj
3007 Points
4 years ago
take 1st ball be b1 and another be b2.
ac/eq of motion
v=u+at
for b1
v=0(at highest height)
0=u-10ร—9(in case of of upward direction)
u=90m/sec
ย for b2, in this case final velocity is "u" since,
v=u + gt
ย =0+10ร—4
ย v=40m/sec
so,u1=90m/sec& u2=40m/sec

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