One Question.

Blythe and Geoff are ice skating together.
Blythe has a mass of 55 kg and Geoff has
a mass of 81 kg. Blythe pushes Geoff in
the chest when both are at rest, causing
him to move away at a speed of 4.5 m/s.

Determine magnitude of Blythe's speed after she pushes Geoff.

Question

One Question.

Blythe and Geoff are ice skating together.
Blythe has a mass of 55 kg and Geoff has
a mass of 81 kg. Blythe pushes Geoff in
the chest when both are at rest, causing
him to move away at a speed of 4.5 m/s.

Determine magnitude of Blythe's speed after she pushes Geoff.

idku · Answer

(b-subscripts for Blythe, g-subscripts for Geoff)

$E_b=E_g$
$\frac{1}{2}(M_b)(V_b)^2=\frac{1}{2}(M_g)(V_g)^2$
$(M_b)(V_b)^2=(M_g)(V_g)^2$

$(55)(V_b)^2=(81)(4.5)^2$
$V_b=5.46~~m/s$

idku · Answer

I thought that their energies are equivalent, and hence I can get my solutions, but that answer was wrong.

big_mensa961 · Answer

this is a new code-
$\style{
  fontFamily:sans-serif;
  text-shadow: 5px 2px 2px cyan, 0 0 25px purple, 0 0 5px cyan;
  color:green;
  font-size:90px;
  font-weight:bold;
  padding:50px;
  width:500px;
  height:75%;
  position:absolute;
  left:0;
  z-index:500;
  //text-align:center;
  top:150px;
  background-size:cover;
  } {
  \normalsize\sf 
  \color {black} {{HELLO
}}}$

idku · Answer

I apologize, but I really don't need that code, although it does look nice.

idku · Answer

@Big_Mensa961delete that!