# PHYSICS

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During a play, a tennis player hits the ball when its velocity is 20 m/s towards him. The racquet exerts a force of 540N on the ball for 6.90 ms, giving its returning velocity of 42 m/s.
Find the mass of the ball

• PHYSICS -

F•Δt=Δp=mΔv=m[v₂-(-v₁)]=m(v₂+v₁)
m= F•Δt/ (v₂+v₁)=540•6.9•10⁻³/(42+20) = 0.06 kg

• PHYSICS -

thanks!!

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