Question

A 5kg mass is dropped from a height of 30m above the ground. Determine the velocity of the mass when it is 18n above the ground take = 10m/s2

Answer 1

v = vi - g t
h = ho - 4.9 t^2
18 = 30 - 4.9 t^2
t^2 = 2.45
t = 1.56 seconds
v = 0 - 9.8* 1.56
v = - 15.3 m/s
or
15.3 m/s down

Answer 2

5kg Mass dropped, height 30m,velocity 18m determined velocity