a. Define linear momentum.
b. Determine the base units of linear momentum in the SI system.
c. A car of mass 900 kg starting from rest has a constant acceleration of 3.5 m s⁻². Calculate its momentum after it has travelled a distance of 40 m.
d. This diagram shows two identical objects about to make a head-on collision. The objects stick together during the collision. Determine the final speed of the objects. State the direction in which they move.

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4.0 kg 4.0 kg 2.0 ms-1 3.0 ms-1 Figure 6.22