Posted by joshua on Tuesday, October 26, 2010 at 10:49am.
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  bobpursley, Tuesday, October 26, 2010 at 11:20am
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  B, Friday, November 5, 2010 at 7:35pm
a) 20.4085
b) 20.8633

physics  nt, Sunday, October 12, 2014 at 9:34am
bob's formula for B) is wrong...
Should be mghforceresistance = 1/2 m Vi^2

physics  kobe, Saturday, August 6, 2016 at 12:55am
nah bruh
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