Question

State Newton’s first law of motion
b) What is momentum? Is it vector or scalar quantity? What is its SI unit?

Answer 1

Answer:

A body at rest or in motion of constant speed will remain at rest or in state of motion unless and until acted by any external force..

Momentum is product of mass and velocity

Vector quantity

kgm/s

kg km/hr

any massXvelocity

Answer 2

Newton's first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. This postulate is known as the law of inertia.

b) Momentum is a physics term; it refers to the quantity of motion that an object has. A sports team that is on the move has the momentum. ... Momentum can be defined as " mass in motion." All objects have mass; so if an object is moving, then it has momentum- it has its mass in motion.

It is vector quantity.

Its SI unit is- Kilogram meter per second(kg•m/s)

Dimension-MLT inverse 1.