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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  just after collision is

a)

2 m/s

b)

 m/s

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)

1 Answer
5876 Votes
3537

Answer Key : (a) -

(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

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

(a)

100 cm

(b)

50 cm

(c)

25 cm

(d)

40 cm


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