Question

A dog with mass 14 kg has a kinetic energy of 135.5 J. What is the speed of the dog?

A. 3.2 m/s
B. 2.3 m/s
C. 4.4 m/s
D. 5.1 m/s

Answer 1

Well \[E = \frac{ 1 }{ 2 }mv^2\]
Rearrange to find v,
\[v = \sqrt{\frac{2E }{ m }}\]
\[v = \sqrt{\frac{ 2(135.5) }{ 14 }}\] = 4.4m/s