Question

A 4-kg ball has a momentum of 12 kg.m/ s. What is the ball's speed?

a. 3 m/s
b. 4 m/s
c. 12 m/s
d. 48 m/s
e. none of these

Answer 1

a. 3 m/s

Step-by-step explanation:

The magnitude of the momentum of an object is given by:

`p=mv`

where

m is the mass of the object

v is the speed of the object

For the ball in this problem, we know:

p = 12 kg m/s is the momentum

m = 4 kg is the mass

Solving the equation for v, the speed, we find:

`v=(p)/(m)=(12 kg m/s)/(4 kg)=3 m/s`