physics

posted by .

A projectile of mass 1.450 kg is shot straight up with an initial speed of 20.0 m/s.

(a) How high would it go if there were no air friction?

(b) If the projectile rises to a maximum height of only 13.9 m, determine the magnitude of the average force due to air resistance.

  • physics -

    The initial KEnergy is 1/2 m v^2

    The PEnergy at to top must be equal to the initial KEnergy.
    mgh=1/2 mv^2 solve for h. Notice m divides out.

    b) forceresistance*13.9=1/2 m v^2
    solve for the force.

  • physics -

    a) 20.4085
    b) 20.8633

  • physics -

    bob's formula for B) is wrong...

    Should be mgh-forceresistance = 1/2 m Vi^2

  • physics -

    nah bruh

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