Question

A ball is dropped from a height h when it reach the ground its velocity is 40 metre per second . findthe height.

Answer 1

u=0m/s
v= 40m/s
g= 10 m/s
h= ?

we will use here third equation of motion i.e
$v {}^{2} = u {}^{2} + 2gh$
$40 {}^{2} = 0 {}^{2} + 2 \times 10 \times h$
1600 = 0 + 20h
1600= 20h
h = 1600/20
h = 80
so, height is 80m

hope you understand.

Answer 2

Answer:

80 m will be the height....