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4-1.Newton's Laws of Motion
easy
$0.05\; kg$ દળના બે બિલિયર્ડ બૉલ $6\; m/s$ ની ઝડપથી ગતિ કરતા કરતા અથડાય છે અને તેટલી જ ઝડપથી પાછા ફેંકાય $(rebound)$ છે. દરેક બૉલને બીજા વડે લગાડેલો આઘાત કેટલો હશે ?
Option A
Option B
Option C
Option D
Solution
Mass of each ball $=0.05\, kg$
Initial velocity of each ball $=6\, m / s$
Magnitude of the initial momentum of each ball, $p_{i}=0.3 \,kg\, m / s$
After collision, the balls change their directions of motion without changing the magnitudes of their velocity.
Final momentum of each ball, $p_{f}=-0.3 \,kg \,m / s$
Impulse imparted to each ball $=$ Change in the momentum of the system
$=p_{f}-p_{i}$
$=-0.3-0.3=-0.6\, kg \,m / s$
The negative sign indicates that the impulses imparted to the balls are opposite in direction.
Standard 11
Physics
