Lesson: Chapter 4 — Newton's Laws of Motion

4.2. Momentum 3 of 7 Reset answers

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Question 3

A motor car has a mass of 800 kg. What is its momentum at a moment when it is moving at 5 m s⁻¹?

A 805 kg m s⁻¹ B 4000 kg m s⁻¹ C 400 kg m s⁻¹ D 160 kg m s⁻¹

The right answer is the one marked above.

4000 kg m s⁻¹.

momentum = m v = 800 kg × 5 m s⁻¹ = 4000 kg m s⁻¹

160 comes from dividing instead of multiplying (800 ÷ 5); 805 from adding. Momentum is always a product.

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