A cricket ball is hit so that it travels straight up
in air and it acquires 3 seconds to reach the
maximum height. Its initial velocity is:
(A) 20 m sec^-1
(B) 25 m sec^-1
(C) 29.4 m sec^-1(D) None of these
Answers
Answer:
ok your answer was
Explanation:
If a ball is thrown vertically upward and it reaches its maximum height in 3 seconds, what would its initial velocity be?
19 Answers

Floris Jansen, PhD Physics, University of Cambridge (1988)
Answered 3 years ago · Author has 88 answers and 94.3K answer views
It depends on where you are when the ball is thrown.
On the moon the velocity would’ve less than on earth.
if we assume a constant acceleration due to gravity of g, and we ignore the effects of rotation of the planet/moon on which you are standing, then the change in velocity after t seconds is g⋅tg⋅t
At the highest point the velocity is 0 m/s, so the initial velocity is −g⋅t−g⋅t
On earth, that makes the answer approximately 29.4 m/s (the value of g changes with position on earth due to the shape of the earth, mountains, non uniform composition and of course rotation … although strictly speaking that only changes the apparent acceleration And not the acceleration due to gravity - a subtlety usually glossed over.
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