Homework Help: PHYSICS

Posted by Hep on Wednesday, December 19, 2012 at 3:55am.

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 - Elena, Wednesday, December 19, 2012 at 4:28am
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 - Hep, Wednesday, December 19, 2012 at 10:55pm
thanks!!

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