Question

A car travels at a constant speed of 12 m/s and has a momentum of 4800 kg∙m/s. What is the mass of the car?

Answer 1

Take into account that the momentum is given by the following formula:

$p=mv$

where,

m: mass of the car = ?

v: speed = 12 m/s

p: momentum = 4800 kg*m/s

Solve the equation above for m, replace the values of p and v, and simplify:

$m=\frac{p}{v}=\frac{4800kg\frac{m}{s}}{12\frac{m}{s}}=400kg$

Hence, the mass of the car is 400 kg