What is the total time of flight of an object projected vertically upwards with a speed of 30m/s [g=10m/s²]

Physics Jamb, Waec, Neco Past Questions & Answers on Speed, Velocity and Acceleration

QUESTIONS 52: What is the total time of flight of an object projected vertically upwards with a speed of 30m/s [g=10m/s²]

NECO 2007 Ans: 6.0s 

Solutions 

initial speed, u=30m/s and g=10m

total time of flight = 2u/g

T = [2(30)/10]seconds

T= [60/10]seconds

T = 6seconds