'ms-2' is the SI derived unit of acceleration. It means that a speed X is changing by 1ms-1 for every second of its acceleration.
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30 mph = 13.41 meter/sec 60 mph = 26.82 meter/sec 100 kph = 27.78 meter/sec
1 mld means how much meter cube per second
Acceleration is 2 meters / sec / sec.
( 1 km/hr ) x (1,000 m/km) x (1/3600 hr/sec) = 5/18 meter/second = 0.2778 meter/second1 meter/sec = 3.6 km/hr
1482 metres per sec = 5335 km per hour = 3315 miles per hour