Question

An object falls from a hovering helicopter and hits the ground at a speed of 30 m/s. How long does it take the object to reach the ground and how far does it fall? Sketch a velocity–time graph for the object

Answer 1

u = 0m/s
v = 30m/s
g = 9.8m/s^2
g = (v-u)/time
9.8 = (30)/t
9.8t = 30
t = 30/9.8
t = 3.06s

Answer 2

Answer: 3s

Explanation: u= 0m/s

v= 30m/s

g= 10m/s^2

g= (v-u)/time

10= 30/t

10t= 30

t= 30/10

t= 3s