Question

a stone dropped from the roof of a house reaches the ground in 1.5 secs. calculate the distance of the roof from the ground and the velocity of the stone with
which it strikes the ground

Answer 1

Here,
initial velocity=0.
final velocity=?(to find)
time=1.5 seconds.
Now,
acceleration =10m/s^2(gravitational force)
So, when anything goes downward it increases it's velocity which means it have acceleration.
a=v-u/t
10m/s^2 = v-0/1.5s
10×1.5=v
15m/s=v
And distance will be 15 m + 1/2 ×15m
=15 m + 7.5 m
=22.5m

Answer 2

Answer:22.5m

Explanation:

Here,

initial velocity=0.

final velocity=?(to find)

time=1.5 seconds.

Now,

acceleration =10m/s^2(gravitational force)

So, when anything goes downward it increases it's velocity which means it have acceleration.

a=v-u/t

10m/s^2 = v-0/1.5s

10×1.5=v

15m/s=v

And distance will be 15 m + 1/2 ×15m

=15 m + 7.5 m

=22.5m