Question

From the roof top of a 250m tall building an object of mass 01 kg is
dropped. Calculate the time which the object will take to reach the earth
surface and the velocity with which it will strike the earth surface.
( g = 10m/s2, √ 2 = 1.414)

Answer 1

Answer:

t=7s, v= -70m/s

Explanation:

s=ut+1/2at^2

-250=0+1/2×(-10)×t^2

-250=-5t^2

t=250/5

t=5√2

t=5×1.4

t=7s

v=u+at

v=0+(-10)×7

v=-70m/s