Projectile motion question (1 Viewer)

[nazfiz]

A body is thrown vertically upwards with a velocity of 12.6 m/s. What time elapses before its velocity is 9m/s

Working out would be appreciated.
thanks

 

[nightweaver066]

v = u + at
9 = 12.6 - 9.8t
9.8t = 3.6
t = 22 seconds

 

[nazfiz]

ohkay. Thanks silly me.