Question

Consider the following two statements

1. Linear momentum of a system of particles is zero

2. Kinetic energy of a system of particles is zero

Then

• A. 1 implies 2 and 2 implies 1
• B. 1 does not imply 2 and 2 does not imply 1
• C. 1 implies 2 but 2 does not imply 1
• D. 1 does not imply 2 but 2 implies 1

Answer 1

Answer: (B)

1 does not imply 2 and 2 does not imply 1

Answer 2

Momentum is a vector quantity whereas kinetic energy is a scalar quantity. If the kinetic energy of a system is zero then linear momentum definitely will be zero but if the momentum of a system is zero then kinetic energy may or may not be zero.