Question

A ball is thrown vertically upward with a velocity of 20 m per second calculate the maximum height attained by the ball

Answer 1

First take g=9.8m/s
v=20m/s
u=0
Therefore, apply the formula:
v^2=u^2 +2gs [s is the height]
(20)^2=0 + (2*9.8*s)
400= 0 + 19.6s
-19.6s= 0-400
s=-400/-19.6
s=20.4082=20.3

Therefore the maximum height attained by the ball is 20.3 metre.