Question

Body Q with linear momentum kg. m/s collides with and also sticks to body R, with linear momentum kg.m/s. The bodies form a closed, isolated system. The direction in which they move after the collision makes an angle with positive x-axis that is equal to:

• A. 45⁰
• B. 135⁰
• C. 180⁰
• D. 315⁰

Answer 1

Answer: (D)

315⁰

Answer 2

For an isolated system, in the absence of external force, linear momentum is conserved.

m₁ - m₂ = (m₁ + m₂)

(m₁ + m₂) = 5i – 5j

θ = 360⁰ – 45⁰ = 315⁰