AI Mentor

Check Your IQ

Free Expert Demo

Try Test

Courses

Dropper NEET Course Dropper JEE Course Class - 12 NEET Course Class - 12 JEE Course Class - 11 NEET Course Class - 11 JEE Course Class - 10 Foundation NEET Course Class - 10 Foundation JEE Course Class - 10 CBSE Course Class - 9 Foundation NEET Course Class - 9 Foundation JEE Course Class -9 CBSE Course Class - 8 CBSE Course Class - 7 CBSE Course Class - 6 CBSE Course

Offline Centres

Consider two skaters $A$ and $B$ initially at rest on ice (friction is negligible) with $A$ holding
a ball. $A$ has greater mass than $B$ and the ball has some significant mass. $A$ throws the ball to $B . B$ catches
it and throws it back to $A$ who catches it again. The magnitudes of the skaters' (excluding ball) final
velocities, momentum and kinetic energies (denoted below as $v, p a n d K$ respectively) are related as

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

$v_{A} = v_{B}$

$p_{A} < p_{B}, K_{A} < K_{B}$

$v_{A} < v_{B}, p_{A} < p_{B}$

${p_{A}}_{} = {p_{B}}_{}, K_{A} < K_{B}$

answer is B, D.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

Let mass of ball $m .$

When $A$ throws the ball momentum of $A$

$∆ P_{A} = m v_{1} (l e f t)$

$v_{1}$ is velocity of ball in ground frame.

When $B$ gather and throws the ball is air with velocity $v_{2}$

$∆ P_{B a l l} = m (v_{1} + v_{2}) (l e f t) ∆ P_{B} = m (v_{1} + v_{2}) (r i g h t) = P_{B}$

Final moments of $A$ + ball

$= ∆ P_{A} + m v_{2} (l e f t) = m v_{1} + m v_{2}$

(Only momentum of $A$ ) $P_{A} < m v_{1} + m v_{2} = P_{B} v_{A} = \frac{P_{A}}{m_{A}} a n d v_{B} = \frac{P_{B}}{m_{B}}$

Since,

$m_{A} > m_{B} v_{A} < v_{B} K_{A} = \frac{{P^{2}}_{A}}{2 m_{A}}, K_{B} = \frac{{P^{2}}_{B}}{2 m_{B}} \Rightarrow K_{A} < K_{B}$

Watch 3-min video & get full concept clarity

courses

No courses found

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Get Expert Academic Guidance – Connect with a Counselor Today!