Question

a object dropped from a height h with a velocity 30 m/s .Find the time taken and h ​

Answer 1

Velocity of a free falling body (starting from rest ) just before hitting ground is given by

sqrt of 2gh
so squaring both sides

v square = 2gh
900 = 20h
h= 45m

now h = ut +1/2at^2
45 = 1/2 × 10 t^2
t = 3sec

hope this helps and is correct :)