Question

A toy truck has a speed of 10 m/s and kinetic energy of 50 J. What is its mass?A. 5 kgB. 4 kgC. 1 kgD. 3 kg

Answer 1

Given data:

Speed: 10 m/s

Ke = 50 J

m = ?

We can use the kinetic energy formula to find the mass of the toy truck:

$Ke=\frac{mv^2}{2}$$\begin{gathered} 50=\frac{m*10^2}{2} \\ \\ 50*2=100m\Rightarrow\frac{100}{100}=m\Rightarrow m=1kg \end{gathered}$

m = 1kg