A4-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

a. 3 m/s

Explanation:

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

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:

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explanation:

e/c, where e is its total energy