Question

2 balls A and B of mass 40 and 50 g respectively are moving with the speed of 40 and 30 m/s respectively . After collision B moved with velocity 25m/s What is the velocity of A

Answer 1

Mass of ball A,m1=40g
Mass if ball B m2=50g
Initial velocity of ball A, u1=40m/s
Initial velocity of ball B, u2=30m/s
Final velocity of ball A, v1=? =v
Final velocity of ball B, v2=25m/s
According to law of conservation of momemtum,
m1 u1 +m2 u2 =m1 v1 +m2 v2
40×40+50×30=40×v+50×25
1600+1500=40v+1250
3100-1250=40v
1850=40v
1850÷40=v
v=46.25
So,v1=46.25m/s
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