Last Updated On [03-11-2023]
Two identical balls 
and 
, each of mass 2 kg and radius 
, are suspended vertically from inextensible strings as shown in Fig. The third ball 
of mass 1 kg and radius 
falls and hits 
and 
symmetrically with 10 m/s. Speed of both 
and 
just after the collision is 3 m/s
|
Speed of |
|||||||
|
a) |
2 m/s |
b) |
|
c) |
5 m/s |
d) |
|
Question ID - 101124 :- Two identical balls and , each of mass 2 kg and radius , are suspended vertically from inextensible strings as shown in Fig. The third ball of mass 1 kg and radius falls and hits and symmetrically with 10 m/s. Speed of both and just after the collision is 3 m/s
Speed of 
just after collision is
a)
2 m/s
b)
m/s
c)
5 m/s
d)
Two identical balls and , each of mass 2 kg and radius , are suspended vertically from inextensible strings as shown in Fig. The third ball of mass 1 kg and radius falls and hits and symmetrically with 10 m/s. Speed of both and just after the collision is 3 m/s
|
Speed of |
|||||||
|
a) |
2 m/s |
b) |
|
c) |
5 m/s |
d) |
|
(a)
First calculate, 
As the ball 
and 
are constrained to move horizontally (immediately after collision), if ‘
’ be the impulse imparted by ball ‘
’ to each of 
and 
, the impulse received by ball 
from them would be 
.png)
Now, each of ball 
and 
received impulse ‘
’ as shown in Fig., but moves horizontally as its vertical comp. gets balanced by impulse imparted to ball 
and 
by the respective strings and hence,
magnitude of impulse)
Now, for ball 
, if its final velocity is 
downwards, we have
sign indicates that it is directed upwards)
Next Question :
|
The power of a lens is + 2.0 D. Its focal length would be |
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|
(a) |
100 cm |
(b) |
50 cm |
(c) |
25 cm |
(d) |
40 cm |
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