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October 21, 2014

October 21, 2014

Posted by **Angela** on Sunday, October 14, 2012 at 12:59pm.

(b) What is the speed of the ball when it leaves the track?

(c) What is the speed of the ball when it hits the ground?

- Physics -
**Elena**, Sunday, October 14, 2012 at 4:24pmm•g•h1=m•v²/2

v=sqrt(2•g•h1)=v(x)

t=x/v =x/v(x) =x/ sqrt(2•g•h1)

h2=g•t²/2=g• x²/ 2•2•g•h1=x/4•h1 =>

h1=x/4•h2=0.81/1.03 =0.79 m

(a) H=h1+h2= 1.03+0.79=1.82 m.

(b) v=v(x)=sqrt(2•g•h1)=

=sqrt(2•9.8•0.79) = 3.93 m/s.

(c)

t=x/v(x)=0.81/3.93 = 0.2 s.

v(y) = gt=9.8•0.2= 1.96 m/s.

v=sqrt{v(x)²+v(y)²} = sqrt(3.93²+1.96²) = 4.4 m/s.

- Physics -
**Angela**, Sunday, October 14, 2012 at 6:05pmThose were all wrong, I don't get it.

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