Final answer:
The unit of linear momentum is kg·m/s, which is obtained from the product of mass (in kg) and velocity (in m/s). The given options in the question are incorrect as they represent other units or are not recognized as standard units.
Step-by-step explanation:
The unit of linear momentum is defined as the product of an object's mass (m) and its velocity (v). Therefore, the formula for linear momentum is p = mv. Given that mass has the SI unit of kilograms (kg) and velocity is measured in meters per second (m/s), the resulting SI unit for momentum is kg·m/s. This is different from force, where the SI unit is the Newton (N), which is equivalent to kg·m/s². Therefore, option a. Ns is incorrect as it represents Newton-second which is the unit for impulse, b. kg ms² is incorrect as it is not a recognized unit of measure, c. Ns⁻¹ is also incorrect since it suggests a rate of change of impulse, and d. Kg2ms⁻¹ is incorrect due to the improper use of kg squared. The correct answer is not listed here, as the SI unit for momentum is simply kg·m/s.