- #1
hannam
- 10
- 0
Homework Statement
a ball makes a free-fall with zero initial
velocity and an arrow with 25 m/s initial velocity is thrown to shoot
this ball at the same time. The ball is initially h=38 m higher than the
arrow.
a) Assume no drag force then how long after does this collision occur?
At what height below ball’s initial position does this collision occur?
b) Assume a constant air drag force at any time instant, which is equal
to Drag Force= 2.2 m where m is the mass of object. For this case,
repeat part a). Take g=9.8 m/s2 for both parts of this and other
questions.
Homework Equations
m.g-2,2m=m.a
h=vo.t+1/2gt^2
The Attempt at a Solution
problem is in b part, i solved a.
mg-2,2m=m.a
a=7,6
h=1/2at^2 =3,8t^2
38-3,8t^2= 25.t -1/2.9,8.t^2
there is an quadratic equation now and i think i should have used another formula, I'm not sure. I appreciate your help :)