what is the velocity of an object dropped from a height of 150 meters when it hits the ground?

Answer 1

 

h(t) = h₀ - (1/2)gt²

 

g = 9.8 m/s²

 

h₀ = 150 m

 

v(t) = dh/dt = -gt

 

When it reaches the ground,

 

h = 0 ⇒ 150 = (1/2)(9.8)t²

t = 5.53 s

 

v(5.53) = -9.8*5.53 m/s ≅ -54.2 m/s