Question

any one solve 24 and 25

Answer 1

24meter


6 second....................

Answer 2

24.
In coming down of football,
u = 0, t = 4/2 = 2 secs
s = h, a = g = 10 m/s²
therefore, now,
s = ut + ½at²
h = 0(2) + ½ (10)(2)²
_____________
=> [[h = 20 m]]
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25. __First case__:
When stone is thrown upward.
a = -g = -10 m/s²
u = 19.6 m/s
v = 0,
then,
v = u + at
0 = 19.6 + (-10)t
[[t = 1.96 secs]] ...................{1}

height covered in air till v = 0, is h.
therefore,
h = ut + ½at²
h = (19.6)(1.96) + ½(-10)(1.96)²
h = 38.416 - 19.208
[[h = 19.208 m]] ....................{2}

__Second case__:
When stone falls down to the foot of tower.
u = 0, a = g = 10m/s²
height covered by stone from its position in air to the foot of tower = H
H = h + height of tower
= 19.208 + 58.8 ...............(from {2})
[[H = 78.008 m]]
so,
H = ut + ½at²
78 = (0)(t) + ½(10)(t)²
15.6 = t²
so, [[t = 3.94 secs]] ....................{3}
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so total time took for the thrown stone to reach foot of tower is
time taken {1 + 3}
which equals,
1.96 + 3.94 = 5.9 secs.
==============
so total time took for the thrown stone to reach foot of tower is 5.9 seconds.
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HOPE IT HELPS YOU.
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