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By def of coefficient of restitution say `mu`

`mu=v/u` v is the velocity after collision and u is velocity before collision.

Thus

`.5= v/3`

`v=1.5ms^(-1)` in the same direction in which sphere was projected.

Since impulse is defined as rate of change of momentum,therefore

Impulse=`2.0xx10^6xx(1.5-3)`

`=-3.0xx10^6` N

momentum lost.

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