A bowling ball has an initial momentum of +30 kg m/s and hits a stationary bowling pin. After the collision, the bowling ball leaves with a momentum of +13 kg • m/s.

Momentum is conserved in the collision. The pin starts with 0 kg • m/s, so the total initial momentum is +30 kg • m/s. Afterward, the ball has +13 kg • m/s, leaving the pin with +30 − +13 = +17 kg • m/s. The correct choice is 17 kg • m/s.

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