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The object is moving at the speed of 50 ms-1 .
6.9 m per second
7.84 minutes (7 minutes 50 seconds) to cover 4km at 8.5m/sec
7 m/s. (meters per second) or 25.2 km/h
The average speed = 1/2 (initial speed + final speed) = 1/2 (15 + 25) = 1/2 (40) = 20 meters per second.The distance traveled = (average speed) x (time) = (20 x 7) = 140 meters.