what is the meaning of " -1 " in 143 km/ h-1
Here, h-1 means per hour.
The object's speed is 143 km/hr or 143 km hr-1 means that it covers 143 km in 1 hour.
The object's speed is 143 km/hr or 143 km hr-1 means that it covers 143 km in 1 hour.