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An object of mass m1=5kg is moving with a speed of vli-12m/s and collides with another...

An object of mass m1=5kg is moving with a speed of vli-12m/s and collides with another object at rest, that has a mass m2=7kg. After the clastie collision these two objects move with different speeds. What is the speed of m1 and m2 after the collision?

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Answer #1

Here m1= 5 kg, u1= 12 m/s

m2= 7 kg , u2=0

After Elastic collition   

velocity of m1 = v1 = ( (m1-m2) /(m1+m2) ) * u1 + ( 2m2/(m1+m2) ) * u2

if u2= 0 the   v1 = ( (m1-m2) /(m1+m2) ) * u1 =    ( (5-7) /(5+7) ) * 12 = -2 m/s

So velocity of M1 = -2 m/s

Now Velocity of m2 = V2 =   ( 2m1/(m1+m2) ) * u1 + ( (m2-m1) /(m1+m2) ) * u2

if U2=0 then   V2 =   ( 2m1/(m1+m2) ) * u1 =    ( 2*5/(5+7) ) * 12 = 10 m/s

So velocity of M2 = 10 m/s

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