The quantity of motion contained in a body is 50 kg m/s. If the body moves with a speed of 5 m/s, what is the mass of the body?

Step 1: Given data

1. Quantity of motion or momentum = 50 kg m/s
2. Speed = 5 m/s

Step 2: Momentum

1. The product of the mass of a body and its velocity is considered momentum.

$Momentum=mass\times velocity$

Step 3: Finding the mass of the body

$$\begin{gathered} Momentum=mass\times velocity \\ 50kgm{s}^{-1}=m\times 5m{s}^{-1} \\ m=\frac{50}{5} \\ m=10kg \end{gathered}$$

Hence, the mass of the body is $10kg.$