Question

a stone is dropped from the top of the building. Find
a)how long does it take to fall 19. metres?
b)how fast does it move at the end of this fall?
c)what is the acceleration after(i)1 sec (ii)2 sec (g=10m/s2

Answer 1

According to the question, the buildinf is 19m in height.
And Given, g= m/s^2
a) Using formula,
S=ut+1/2 at^2
19m = 0m/s × t + 1/2 × 10m/s × t^2
19=1/2 × 10t^2
19=5t^2
19/5=t^2
$t = \sqrt{19 \div 5}$
t = 1.95sec

b) v=u+at
v=0+10×1.95
v=19.5m/s

c) I didn't understand the question clearly here.
Hope it helps.