Please, can anyone explain how to solve the last problem

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midnightsun · 26-30, M

It's simple. Since it's an isolated and frictionless system, use law of conservation of momentum.

Momentum of bullet before penetration = momentum of bag + momentum of bullet after penetration

Momentum formula is mass* velocity

midnightsun · 26-30, M

The answer..here you go

Hanging2 · 51-55, M

@midnightsun you are right sir

midnightsun · 26-30, M

@Hanging2 thanks