Name the different national parties ?
Answers
Explanation:
When the stone is dropped from the balloon, its initial velocity is the same as the velocity of the balloon at that instant.
The upward acceleration of the balloon is a=2m/s
2
The balloon starts from rest, so u= 0 m/s
The balloon rises for 1 s before the stone is dropped, hence we have
v =u + at
v=0+=2 m/s in the vertically upw ard direction.
This is the initial velocity of the stone after being dropped.
The distance moved up by the balloon in 1 second is
v
2
=u
2
+2as
v
2
=2as
∴S=
2a
v
2
=
4
4
=1m
Hence, the stone falls by 1 m before hitting the ground
Now, the acceleration on the stone after being dropped is g=9.8m/s
2
Hence, for the stone,
we have
u=−2m/s;s=1m;a=9.8m/s
2
;t=1s
u is negative as it is in the upward direction
Hence, using third equation of motion,
we get time as
s=ut+
2
1
at
2
1=−2t+
2
1
×9.8t
2
4.9t
2
−2t−1=0
∴=t=
2×9.8
2
−
+
(−2)
2
−4×4.9×(−1)
=
2×9.8
2
−
+
4+19.6
=
9.8
2
−
+
23.6
Since, time cannot be negative, we have
t=
9.8
2+
23.6
=0.7s
Hence, the stone will strike the ground 0.7 s after being dropped from the balloon.
hence (B) option is correct
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More Questions by difficulty
EASY
MEDIUM
HARD
Answer:
Bharatiya Janata Party
BJP
1980
2.
Indian National Congress
INC
1885
3.
Communist Party of India (Marxist)
CPI-M
1964
4.
Communist Party of India
CPI
1925
5.
Bahujan Samaj Party
BSP
1984
6.
Nationalist Congress Party
NCP
1999
7. All India Trinamool Congress TMC 1998
8. National People's Party NPP
Explanation: