Question

a body is allowed to fall freely from a height of 2000 metres find time taken to take to reach the ground (g= 10 m s -²)​

Answer 1

GIVEN -

height = 2000 m

g = 10 m/s²

TO FIND -

time taken

FORMULA TO BE USED -

$s = ut + \frac{1}{2}at^{2}$

SOLUTION -

$2000 = 0 + \frac{1}{2} (10)(t)^{2}\\\\2000 = 5t^{2}\\\\400 = t^{2} \\\\t = 20 s$

ANSWER -

The body will reach the ground in 20 seconds time.

Answer 2

Explanation:

h = 1/2gt^2

h = 1/2 × 10 × t^2

2000 = 5 × t^2

2000/5 = t^2

t^2 = 1000

t = 10s