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Last Updated On 23-10-2022 - By Sara

Two pendulums each of length  are initially situated as shown in fig. The first pendulum is released and strikes the second. Assume that the collision is completely inelastic and neglect the mass of the string and any frictional effects. How high does the centre of mass rise after the collision?

a)

b)

c)

d)


Question ID - 100173 :-

Two pendulums each of length  are initially situated as shown in fig. The first pendulum is released and strikes the second. Assume that the collision is completely inelastic and neglect the mass of the string and any frictional effects. How high does the centre of mass rise after the collision?

a)

b)

c)

d)

1 Answer
5876 Votes
3537

Answer Key : (a) -

(a)

Applying the law of conservation of momentum,

(i)

Where is the velocity with which  collides with

Therefore,

Now,let the centre of mass rise through a height  after collision. In this case, the kinetic energy of  system is converted into potential energy at maximum height



Next Question :

The size of image formed by a concave mirror is same as the size of object. The position of the object will be

(a)

at F

(b)

between F and C

(c)

at C

(d)

between C and infinity


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