Physics, 19.02.2021 08:50 amunnik04

Can someone help me? I already know half of the answer, just need the other!! Post-explosion speed of the cannon: -3 m/s
Post-explosion speed of the tennis ball: ← need this part
Question: A 50-gram tennis ball is loaded into a 2-kg homemade cannon. The cannon is at rest when it is ignited. Immediately after the impulse of the explosion, a photogate timer measures the cannon to recoil backwards a distance of 6 cm in 0.02 seconds. Determine the post-explosion speed of the cannon and of the tennis ball (watch your units!!!)

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Can someone help me? I already know half of the answer, just need the other!! Post-explosion speed...