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A ball is thrown vertically upward from the top of a tower with an initial velocity of 19.6 metre per second the ball which is the ground after 5 seconds. calculate first the height of the tower and the velocity of ball reaching the ground take g is equals to 9.8 metre per second square

A ball is thrown vertically upward from the top of a tower with an initial velocity of 19.6 metre per second the ball which is the ground after 5 seconds. calculate first the height of the tower and the velocity of ball reaching the ground take g is equals to 9.8 metre per second square

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Grade:9

1 Answers

Vikas TU
14149 Points
7 years ago
From the top of the tower when the ball is thrown and when it reaches the bottom again,
the Time taken total = 2u/g => 4 seconds 
that means it takes 5-4 =1 s to travel the tower height.
and max. height it takes = > u^2/2g => 19.6*19.6/2*9.8 => 19.6 meter.
From first law of eqn. we get,
v = 19.6 – g*4 => -19.6 m/s.
Hence from second’s law of eqn. we get,
h = 19.6*1 + 0.5*9.8*1^1 = > 24.5 meter.

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