Two perfectly elastic objects A and B of identical mass are moving with velocities 15${\rm{m}}{{\rm{s}}^{ - 1}}$ and 10${\rm{m}}{{\rm{s}}^{ - 1}}$ respectively, collide along the direction of line joining them. Their velocities after collision are respectively

${\rm{10m}}{{\rm{s}}^{ - 1}},\,15m{s^{ - 1}}$

${\rm{20m}}{{\rm{s}}^{ - 1}},\,5m{s^{ - 1}}$

${\rm{0m}}{{\rm{s}}^{ - 1}},\,25m{s^{ - 1}}$

${\rm{5m}}{{\rm{s}}^{ - 1}},\,20m{s^{ - 1}}$

JEE PHYSICS MCQ: WORK-ENERGY-POWER

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Application +4 | -1

Two perfectly elastic objects A and B of identical mass are moving with velocities 15

\mathrm{m}{\mathrm{s}^{ - 1}}

and 10

\mathrm{m}{\mathrm{s}^{ - 1}}

respectively, collide along the direction of line joining them. Their velocities after collision are respectively

View answer and explanation

Correct option: A

\mathrm{10m}{\mathrm{s}^{ - 1}},\,15m{s^{ - 1}}

Option A (

\mathrm{10m}{\mathrm{s}^{ - 1}},\,15m{s^{ - 1}}

) is correct because in a perfectly elastic collision with identical masses, the velocities are exchanged.

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v_1