Medium
$A$ ball of mass $0.1 \, kg$ coming with a speed of $30 \, m/s$ strikes a bat and returns in the opposite direction with a speed of $40 \, m/s$. Calculate the impulse. (Take the final velocity as positive.)
- A$ - 0.1 \times (40) - 0.1 \times (30)$
- B$0.1 \times (40) - 0.1 \times (-30)$
- C$0.1 \times (40) + 0.1 \times (-30)$
- D$0.1 \times (40) - 0.1 \times (20)$
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