Question

What is the momentum of a 76-kilogram horse running at a speed of 45 kilometers/hour?

A) 2.5 x 10^2 kilogram-meters/second
B) 3.4 x 10^4 kilogram-meters/second
C) 3.4 x 10^3 kilogram-meters/second
D) 9.5 x 10^2 kilogram-meters/second

Answer 1

Momentum of horse,
`9.5* 10^2\ kg-m/s`

Step-by-step explanation:

It is given that,

Mass of the horse, m = 76 kg

The speed of the horse, v = 45 km/h

Converting km/h to m/s, i.e. v = 12.5 m/s

The product of mass of horse and the velocity with which it is moving give its momentum. Mathematically,

`p=m* v`.......(1)

So, putting the values of m and v in equation (1) gives :

`p=76* 12.5`

p = 950 kg m/s

or

`p=9.5* 10^2\ kg-m/s`

Hence, the correct option is (D).