Center of Mass and System of Particles: RE-NEET 2026

Medium· Collisions (Elastic Collision)· +4 / −1

Bob

B

of mass

m

at rest is hanging vertically from the ceiling via a massless string of length

10

m, as shown in the figure. Point mass

A

of mass

m

travelling horizontally with speed

10\ \mathrm{ms^{-1}}

hits bob

B

elastically. The bob

B

rises

h

meter after the collision. Taking the acceleration due to gravity

g = 10\ \mathrm{ms^{-2}}

and neglecting the size of the bob, the value of

h

is: Figure: bob

B

hangs at rest from a ceiling by a string; mass

A

approaches from the left with speed

10\ \mathrm{ms^{-1}}

along the horizontal line through

B

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