Question

A ball thrown vertically upward reaches a maximum height of 20m find at what height it velocity be half intial velocity

Answer 1

Explanation:

its velocity if be half if its initial velocity at 10m

Answer 2

answer =20

Explanation:

initial velocity=0

acceleration=10

v^2=u^2 +2as

u^2= v^2-2as

=0^2-2×10×20

=0- 20×20

=0-400

u^2=400

u=20

then,

u^2

2g

=400

2×10

=400

20

20