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Sagot :
According to the given statement is 43.7 N average force acts on the ball.
What is the average force ?
The average force is a force applied by an object travelling more than a specific period of time at a given rate of speed, or velocity. This velocity is not instantaneous or accurately measured, as the word "average" implies.
Briefing:
Mass of tennis ball is =57 gm
velocity of ball=21 m/s
At a speed of 25 m/s, the player volleys the ball back (i.e. in opposite of initial direction)
Time of contact=0.06 s
We know change in momentum(ΔP) = Impulse (Fdt)
Initial momentum = 57 * 10⁻³ * 21
Final momentum = -57 * 10⁻³ * 25
Change in momentum
ΔP = 57 * 10⁻³ * 21 - (-57 * 10-3 * 25)
ΔP = 57 * 10⁻³ * 46 = 2.622 kg-m/s
Now 2.622 kg-m/s = F[tex]_a_v_g[/tex] * 0.06
F[tex]_a_v_g[/tex] = 43.7 N
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