Question

An object is thrown vertically upwards with a velocity 20 m per second.Calculate the maximum height it could acquire.(g=10m/s^2).

Answer 1

u =20 m/s
v = 0 m/s     {at upward case v=o and' g 'become negative}
g = 10 m/s²
using, v²=u² +2gh
          0²=20²+2*-10*h
          0 =400-20h
     -400 =-20h
     -400/-20=h
∴ h=20 m

Answer 2

We know that initial velocity is 20m/s.
Final velocity is 0m/s.
Gravity is 10m/s^2

Using v^2 = u^2+ 2gS
We get,
Height as 20m