Question

In the .... ......of an external force, the algebraic sum of the momentum after collision, is equal to
the algebraic sum of the momentum before collision.

a. absence
b. presence
c. both a and b
d. none of these​

Answer 1

Answer:

a. b. c. d.

Explanation:

absence

presence

both a and b

none of these

Answer 2

absence  

The algebraic sum of the momentrum after collision is numerically equal to the algebraic sum of the momentrum before collision.