what is the unit for translational speed? is it the same as m/s or different?

speed is m/s, it is a scalar and you can measure it with a speedometer

velocity is ALSO m/s but is a vector. You need both a speedometer AND a compass to measure it.

speed is the magnitude of the velocity vector.

May be its rad/sec.

NO ! radians per second is angular velocity or speed.

speed = radius * w
where w = angular speed in radians/second and radius is in meters then speed is m/s still
radians has no linear units, just 2pi of them is a circle.

The unit for translational speed is meters per second (m/s). Translational speed is a measure of how fast an object is moving in a straight line, typically in a linear motion. It represents the distance covered per unit of time, specifically the number of meters traveled in one second. Therefore, when discussing translational speed, the unit of measurement is indeed m/s. To calculate translational speed, divide the distance traveled by the time taken.