4. speed, because there is a mention of time
Speed v/s Velocity:
- Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement.
- Velocity is speed with a direction.
- For example: The Dog runs at 9 km/h (kilometers per hour) is a speed. But saying he runs 9 km/h Westwards is a velocity.
Thus, the correct option is 4 since no direction is given so it cannot be velocity.
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