A firecracker stuck into a 150 g apple explodes and sends five apple fragments in different directions. The vector sum of momenta 1, 2, 3, and 4 is found from a video of the event to have components p_x = -1.20 kg * m/s, p_y = -0.80 kg * m/s (with no other component). The mass of the fifth fragment is 0.050 kg. What is its velocity right after the explosion?
2.1 m/s , 42 m/s , 18 m/s , or 29 m/s
?? not sure which it would be!

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here we have to apply the conservation of total momentum

ok!

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