Physics

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A 75 kg man on a 39kg cart traveling at a speed of 2.3 m/s. He jumps off with zero horizontal speed realative to the ground. What is the resulting change in the speed of the cart?

I tried using m1v1=m2v2 but that didn't work out since I was expose to get 4.4 m/s as the answer. I can't figure out what i did wrong will you please show me how to solve this problem?

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