Description
A small ball (m= 0.25kg) traveling to the right with a velocity of 16.0m/s makes a perfectly elastic collision with a heavier ball (m=2.00kg) moving to the left with a velocity of 4.00m/s. What is the final velocity of each ball?
Explanation & Answer
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m1u1+m2u2 =m1v1+m2v2
ie momentum before collision = momentum after collision
v1=u1(m1-m2)+2m2u2/m1+m2
v1=4(2-0.25)+2*0.25*16/2.25
= 6.66 for heavier ball
v2=16(0.25-2)+2*2*4/2.25
=-5.33 for smaller ball
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