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`        A bullet of mass m moving with a velocity v collides head on with a block of mass m which is placed on a car of mass 4m. Bullet gets embedded in the block. The block is connected with car by massless spring of constant k. Find the maximum compression x of the spring. Neglect friction everywhere.`
7 years ago

68 Points
```										Dear Abdul , Always apply the two principles given below , trying with the force approach maybe complex,
Momentum conservation:
momemtum of bullet = momentum of (bullet + mass m +car)
mv =(m+m+4m) .v2
therefore , v2 = v/6
energy conservation:
k.e of energy of bullet  = k.e of ( car +mass+ bullet ) + p.e of spring
1/2 * m* v2  = 1/2*(m+m+4m)*(v/6)2  + 1/2 *k *x2
5mv2/6 =  kx2
x = (5mv2/6k)1/2
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```
7 years ago
18 Points
```										Sir,
Thanks alot for spending your precious time. My approach is exactly same as yours. But unforunately the answer is not correct.
```
7 years ago
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