Question

A stone is dropped from the edge of aroof a. How long it takes to fall 4.9 m ? B. How fast does it moves at the end of the fall ?C. What will be its acceleration after 1 second and 2 second

Answer 1

given- u=0m/s

s=4.9m

a=g=9.8m/s²

for (a) s= ut+1/2at²

4.9= 0×t+1/2×9.8×t²

t²=4.9/2×9.8

t²=4.9×4.9

t=4.9 s

for (b)

v²-u²=2as

v²=2×10×9.8

v²=2×98

v²=196

v=√196

b) v=14m/s

again,for c

after 1 second,

s=ut+1/2at²

4.9=1/2×a×(1)²

a=1.25m/s²

at 2 second,

s=ut+1/2at²

4.9=1/2a(2)²

a=2.25m/s²

Answer 2

↪See attachment ☝☝

Hope this may helpful to uh ❤