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mass of the arrow :- ma = 0.02 kg

speed of the arrow :- va = 250 m/s

mass of the baseball mb = 0.14 kg

We have to find the speed of the baseball if the baseball & arrow have the same kinetic energy.

The kinetic energy is proportional to the mass of the object m and to the square of the speed of the object v:

Ek = m * v2 / 2