Correct Answer: 1000 kg ms–1

Key Points

• Momentum is defined as the product of mass and velocity.
• The formula for momentum (p) is given by p = m × v, where m is mass and v is velocity.
• In this case, the mass of the body is 50 kg and its velocity is 20 m/s.
• Substituting the values into the formula gives p = 50 kg × 20 m/s.
• This calculation results in a momentum of 1000 kg ms–1.

Why Other Options Are Wrong

• 25 kg ms–1: This option is incorrect as it represents a much lower momentum, which could be derived from a much smaller mass or velocity.
• 40 kg ms–1: This option is also incorrect. It does not accurately reflect the product of the given mass and velocity.
• 100 kg ms–1: This value is still incorrect, as it suggests a lower velocity or mass than what is actually provided in the question.

Quick Tip for Exam

When calculating momentum, always remember to use the correct formula p = m × v. Ensure that you multiply the mass in kilograms by the velocity in meters per second to get the momentum in kg ms–1. Double-check your calculations to avoid simple arithmetic errors.