A ball of mass 1 kg moving with a veloci...

A ball of mass 1 kg moving with a velocity of `"0.4 ms"^(-1)` collides with another stationary ball. After the collision, the first ball moves with a velocity of `0.3ms^(1)` in a direction making an angle of `90^(@)` with its initial direction. The momentum of the second ball after the collision will be (in kg `ms^(-1)`)

0.1

0.3

0.5

0.7

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