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Sagot :
The average force exerted on the ball : 720 N
Further explanation
Impulse: the product of the average net force on an object and time interval
Can be symbolized: J
The formula:
[tex]\rm J=F_{average}.\Delta T[/tex]
J = F average (t2-t1)
Impulses also show changes in momentum , so they can be combined into
F • Δ t = m • Δ v.
So the forces acting on objects are:
[tex]\rm F=\dfrac{m.\Delta v}{\Delta t}[/tex]
Given
m tennis ball = 60 gr = 0.06 kg
Δt = 5.0 ms = 5 x 10⁻³ s
since force is a vector and time is a scalar, then we assume the direction of the racket that hits the tennis ball is positive, then the direction v1 = vi = negative and v2 = vf = positive
v1 = v approaching = vi(initial velocity) = -30 m / s
v2 = v away = vf(final velocity) = + 30 m / s
Δ v = vf-vi = 30 - (-30) = 60 m / s
The average force :
[tex]\rm F=\dfrac{0.06.60}{5.10^{-3}}\\\\F=\boxed{\bold{720~N}}[/tex]
Learn more
momentum on the rocket and balloon
https://brainly.ph/question/540807
Momentum of a moving car
https://brainly.ph/question/1282775
momentum of a small toy cart and a huge truck
https://brainly.ph/question/525871
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