Question

a ball thrown vertically upward rises 250 m and then begins to fall..with what velocity was it projected?

Answer 1

We have ,
V=0
Height (h)=250m
Acceleration(g)= -9.8
Find u
From the 1st equation of motion, we have,
V^2-U^2=2as
(0)^2-u^2=2x-9.8x250
-u^2= -4900
U^2=4900
U=root under 4900
Therefore, U=70

Therefore, the ball was projected vertically upward with a velocity of 70m/s.