Question

An object moving with a speed of 8 m/s has a momentum of 56 kg m/s. What is the object's mass?

Answer 1

Given,

The speed of the object v=8 m/s

The momentum of the object, p=56 kg·m/s

The momentum of an object is calculated as the product of the velocity of the object and its mass.

Thus the momentum of the object is,

$p=mv$

Where m is the mass of the object.

Thus,

$m=\frac{p}{v}$

On substituting the known values,

$\begin{gathered} m=\frac{56}{8} \\ =7\text{ kg} \end{gathered}$

Thus the mass of the object is 7 kg.