Question

The height of tower when stone dropped from it reaches ground in 5 s is
(a)130 m
(b)125 m
(c)150 m
(d)200 m

Answer 1

Answer:

(b) 125

Explanation:

initial speed u= 0 m/s

time taken to reach the ground t = 5s

height of the tower H = (1/2)*10*5*5

h= 125

Answer 2

Answer:

b) 125m

Explanation:

Initial velocity= u= 0m/s

Acceleration= 10m/s^2(round off of gravity= 9.8m/s^2)

Time= 5s

Distance/ Height= s

we know that

s= ut+1/2at^2

=0x5+1/2x10x5x5

=0+ 250/2

= 125 m