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**1. The problem statement:**

A 98 kg man lying on a surface of negligible friction shoves a 86 g stone away from himself, giving it a speed of 4.5 m/s. What speed does the man acquire as a result?

A 98 kg man lying on a surface of negligible friction shoves a 86 g stone away from himself, giving it a speed of 4.5 m/s. What speed does the man acquire as a result?

**2. Homework Equations :**

Pi = Pf

M1V1 + M2V2 = M1V1 + M2V2

Pi = Pf

M1V1 + M2V2 = M1V1 + M2V2

**3. The Attempt at a Solution :**

I've tried the formula above, and I got this far:

98 x 0 + 0.086 x 0 = 98 x X + 0.086 x 4.5

0 = 98X + 0.387

-0.387 = 98X

-0.387/98 = X

X = -0.00394897959 m/s

I've tried the formula above, and I got this far:

98 x 0 + 0.086 x 0 = 98 x X + 0.086 x 4.5

0 = 98X + 0.387

-0.387 = 98X

-0.387/98 = X

X = -0.00394897959 m/s

That's what I got. I have a feeling that I've done something wrong. The online Assignment system is telling me my answer is wrong, so what am I doing wrong? Have I missed something? All help is greatly appreciated :D