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AIPMT 2003 Physics and Chemistry Paper
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© examsnet.com
Question : 1
Total: 100
If a ball is thrown vertically upwards with speed
u
, the distance covered during the last '
t
' seconds of its ascent is :
ut
1
2
gt
2
u
t
−
1
2
g
t
2
(
u
+
g
t
)
t
Validate
Solution:
Let time of flight be
T
then
T
=
u
g
Let
h
be the distance covered during last '
t
' second of its ascent
Velocity at point
B
=
v
B
=
u
−
g
(
T
−
t
)
=
u
−
g
(
u
g
−
t
)
=
g
t
⇒
h
=
v
B
t
−
1
2
gt
t
2
⇒
h
=
gt
2
−
1
2
gt
2
=
1
2
gt
2
© examsnet.com
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