If a tennis ball has a velocity of 18 m/s and a momentum of 1.06 kg • m/s, what is the mass of the tennis ball in grams? Round the answer to two significant figures. grams
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The change in momentum
Δp=m(vf−vi)
=0.150(60−(−40))
=0.150×100=15Ns
Thus, F=ΔtΔP=5×10−315=3×103N
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