Ana B asked in Science & MathematicsPhysics · 1 decade ago

Dropped tennis ball! Please help me to solve this problem... thanks a lot?

After you drop a tennis ball of 0.5 kg from rest at a height of 3.8 m onto a hard floor, find the fallowing:

a) what will be the speed of the ball at the instant of contact with the floor?

Thank you!

v=8.63m/s

b) what force does the floor exert on the ball?

(f)=?N

c) Over what time does the force act in bringing the ball to rest?

(delta)t=?s

Thanks!

2 Answers

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  • 1 decade ago
    Favorite Answer

    a) 8.63*.5

    b) same answer as a bc of = but opposite

    c) (.5)*((3.8)/delta(t))=8.63 solve for t

  • 1 decade ago

    Energy before the drop should equal energy after drop(release and motion of ball)

    m=mass

    g=9.81m/s^2

    h=height from floor

    v=velocity

    Energy before:potential energy: mgh

    Energy afterwards: kinetic energy: 1/2 mv^2

    mgh=(1/2)mv^2

    solve for v

    v=sqrt(gh/.5)

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