Read the given assertion and reason based statements and choose the correct option:
1. Assertion (A):
An object moving along a straight line with constant speed is said to be in uniform linear motion.
Reason (R): Uniform linear motion involves motion along a straight line with an unchanging speed.
Reason (R): Uniform linear motion involves motion along a straight line with an unchanging speed.
2. Assertion (A):
Knowing only the total distance travelled by a train is not sufficient to determine whether its motion is uniform.
Reason (R): Uniform motion is identified by comparing distances covered in equal intervals of time.
Reason (R): Uniform motion is identified by comparing distances covered in equal intervals of time.