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Description Of Motion In One Dimension
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A body released from a great height falls freely towards theearth.
Another body is released from the same height exactly one secondlater.
The separation between the two bodies two second after the release of the second body is
9.8 m
24.5 m
19.6 m
4.9 m
A boy takes 90 second to walk up a stalledescalater.
However if the escalator is moving and the boy stands on the escalator, he is carried up in oneminute.
How much time the boy would take to walk up the moving escalator
40 s
43.75 s
41.25 s
36 s
A body starts from rest and travels is distance x with uniform acceleration, then it travels a distance 2x with uniform speed , finally it travels a distance3x with uniform retardation and comes torest.
If the complete motion of the particle is along a straight line, then the ratio of its average velocity to maximum velocity is
3/5
2/5
4/5
6/7
A stone is dropped from a certain height which can reach the ground in 5 second
. If the stone is stopped after 3 second of its fall and then allowed to fallagain.
Then the time taken by the stone to reach the ground for the remaining distance is
2 s
NONE OF THESE
4 s
3 s
The distance through which a body falls in the nth second is h. The distance through which it falls in the next second is
h + g/2
h - g
h + g
H
A steam boat goes across a lake and comes back (i) on a quiet day when the water is still and (ii) on a rough day when there is a uniform current so as to help the journey onwards and to impede the journey back
. If the speed of the launch on both days was same, the time required for complete journey on the rough day, as compared to the quiet day will be
less
more
NONE OF THESE
Same
Two different masses m and 2m are fallen from height H1 and H2respectively.
First mass takes t second and another takes 2t second, then the ratio of H1 and H2 is
2:1
0.25:1
NONE OF THESE
4:1
A ball falls freely from rest
. The ratio of the distances traveled in first, second, third and fourth second is
1 : 1 :1 : 3
1 : 1 :1 : 2
1 : 3 :5 : 7
1 : 2 :3 : 4
A train runs past a telegraph pole in 15 second, and through a tunnel 450 metre long in 45 s. The length of the train is
425 m
450 m
325 m
225 m
A particle starting from rest travels a distance x in first 2 second and a distance y in next 2 second, then
y =2x
y = x
y = 4x
y = 3x
A dust packet is dropped from 9th storey of a multi-storeyedbuilding.
In the first second of its free fall another dust packet is dropped from 7th storey 15m below the 9thstorey.
If both packets reach the ground at same time, then height of the building is
25m
16m
20m
15m
A ball released from a certain height falls 5 m in onesecond.
In 4 s it falls through
20 m
40 m
1.25 m
80 m
A drunkard is walking along a straightroad.
He takes 5 steps forward and 3 steps backward, followed by 5 steps forwards and 3 steps backward and so on. Each step is one metre long and takes onesecond.
There is a pit on the road 11 metre away from the startingpoint.
The drunkard will fall into the pit after
37 s
29 s
21 s
31 s
Two bodies begin a free fall from rest, the same height, 1 secondapart.
How long after the first body begins to fall will the two bodies be 10 apart
1.5 s
2 s
0.5 s
3.5 s
A rifle bullet loses 1 / 20th of its velocity in passing through aplank.
The least number of such planks required to just stop the bullet is
20
5
10
11
A body covers 26 m, 28 m, 30 m, 32 m in 10th s, 11th s, 12 th s and 13 th srespectively.
The body starts
from rest and moves with uniform acceleration
with an initial velocity and moves with uniform velocity.
with an initial velocity and moves with uniform acceleration
from rest and moves with uniform velocity
Drops of water fall from the roof of a building 9 m high at regular intervals of time, the first drop reaching the ground at the same instant the fourth drop starts itsfall.
What are the distances of the second and third drops from the roof
4 m and 1 m
4 m and 2 m
6 m and 2 m
6 m and 3 m.
A stone is dropped from the top of the tower and reaches the ground in 3 s.Then the heigh of the tower is
44.1 m
39.2 m
98 m
18.6 m
A body moving with uniform retardation covers 3 km before its speed is reduced to half its initialvalue.
It comes to rest in another distance of
3 km
1/2 km
1 km
2 km
A boy releases a ball from the top of abuilding.
It will clear a window 2 m high at a distance 10 m below the top in nearly
1.3 s
1 s
0.13 s
0.6 s
1
2
3
5
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