Inelastic collision: 10kg and 5kg masses, final speed

Practice question

Question

A 10kg mass at 8m/s collides inelastically with a stationary 5kg mass. What is the final speed?

Options

Choose one · Correct answer highlighted

5 m/s Correct 4 m/s 6 m/s 7 m/s

Explanation

Momentum conservation: 10×8=(10+5)vf⇒80=15vf⇒vf=8015≈5.33m/s. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 5 m/s as the result, so option A is correct.

Share this question

Related blogs

Guides and insights connected to this topic

Cell Biology 31 Aug 2026

Plasmolysis: Definition, Types, Forms, Examples and Significance

Learn what plasmolysis is, how it works in plant cells, and why it matters in biology with clear definitions and examples.

Cell Biology 31 Aug 2026

Bone Cells: Types, Structure, Functions, Remodeling and Disorders

Learn about the three main types of bone cells—osteoblasts, osteocytes, and osteoclasts—their roles in bone formation, maintenance, and remodeling.

Cell Biology 31 Aug 2026

Cancer Cells: Morphology, Development, Types and Differences from Normal Cells

Learn how cancer cells differ from normal cells in growth, structure, and behavior, including key morphological changes and development patterns.