The dimensions of momentum are MLT-1. Momentum is a physical quantity that measures the amount of motion an object has. It is defined as the product of an object's mass and velocity. Mass is a measure of the amount of matter in an object, while velocity is a measure of the speed and direction of motion of the object. The dimension of mass is M (in kilograms), the dimension of velocity is LT-1 (in meters per second), and the dimension of momentum is the product of mass and velocity, which is MLT-1. Therefore, the dimension of momentum is MLT-1.