Atest rocket is launched vertically from guard level (y= 0m) at time t = 0.0s. the rocket engine provides constant acceleration during the burn phase. at the instant of the engine burnout the rocket has risen to 49m and acquired a velocity of 30 m/s. how long did the burn phase last

If the rocket had zero speed at ignition and 30 m/s at burnout, and the acceleration was constant throughout the burn, then its average speed over the duration was 15 m/s .

Time = (total distance covered) / (average speed)  

Time = (49 m) / (15 m/s)

Time = 3.27 seconds

when it gains or loses electrons

colorectal cancer may also develop from areas of abnormal cells in the lining of the colon or rectum. this area of abnormal cells is called dysplasia and is more commonly seen in people with certain inflammatory diseases of the bowel such as crohn's disease or ulcerative colitis.