Question

a stone is thrown vertically upward with a velocity of 20m/s. when will its speed be 6m/s and at what altitude

Answer 1

hey dear your answers is here.

u=20
v =6
a =-10
s=?
2as= v^2- u^2
2×10×s = 36-400
s = 364/20
s = 18.2 m

Answer 2

V²=U²-2gh

6²=20²-2×10×h

h=18.2m

V=U-gt

6=20-10×t

t=1.4sec