Acement block accidentally falls from rest from the ledge of a 15.0m high building. when the block is 14.0m above the ground, a man who is 1.71m tall looks up and notices that the block is directly above him. how much time does he have to move out of the way?

Given that,

For free falling body, acceleration is equal to acceleration due to gravity.

a = g = 9.81 m/s²

Distance to be covered, s = 15 - 1.71

s = 13.29 m

At top initial velocity, Vi = 0

Since,

s = Vi *t + 1/2 at²

13.29 = 0 + 0.5 * 9.81 * t²

t = 1.646 s

The man have 1.65 seconds to move out of the way.

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods