In a uniform circular motionVelocity is uniformSpeed is uniformAcceleration is zeroBoth (1) and (3)

In a uniform circular motion:

1. Velocity is not uniform: Velocity is a vector quantity, meaning it has both magnitude (speed) and direction. In uniform circular motion, the speed of the object might be constant, but the direction of the velocity is always changing (as the object is always changing direction), so velocity is not uniform.

2. Speed is uniform: In uniform circular motion, the speed of the object is constant. This is what is meant by 'uniform' in 'uniform circular motion'.

3. Acceleration is not zero: Even though the speed is constant, there is still acceleration. This is because acceleration is a change in velocity, and as mentioned above, the velocity is changing due to the change in direction. This acceleration is called centripetal acceleration and it is directed towards the center of the circle.

4. Both (1) and (3) are correct: As explained above, in uniform circular motion, the velocity is not uniform and there is an acceleration (it's not zero). So, this statement is correct.