Question

please explain your answer I will mark it as brainliest answer​

Answer 1

S(height)=180 m

U for stone A= 0 m/s

And a= 10 m/s

So,

v²=2as+u²

v²=2×10×180

v√3600

v=60 m/s

So to find the time ,

S=ut+1/2at²

180=1/2×10×t²

√36=t

t=6 s

But for B the time taken would be 6/2 s= 3s

For stone B the u = 0 m/s

So,

v=u+at

u=at -0

u=10×3 m/s

u=30 m/s

So d is correct